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</div><h2>HL Paper 1</h2><div class="question">
<p class="p1">Which species has the electron configuration of \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{8}}}\)?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>Ni</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{N}}{{\text{i}}^{2 + }}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>Fe</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{C}}{{\text{u}}^{2 + }}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which statements are correct for the alkali metals Li to Cs?</p>
<p class="p1">I. Melting point increases</p>
<p class="p1">II. First ionization energy decreases</p>
<p class="p1">III. Ionic radius increases</p>
<p class="p1">A. I and II only</p>
<p class="p1">B. I and III only</p>
<p class="p1">C. II and III only</p>
<p class="p1">D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which series is arranged in order of <strong>increasing</strong> radius?</p>
<p>A. \({\text{F}} < {\text{C}}{{\text{l}}^ - } < {\text{Cl}}\)</p>
<p>B. \({\text{Rb}} < {\text{K}} < {\text{Na}}\)</p>
<p>C. \({\text{A}}{{\text{l}}^{3 + }} < {\text{M}}{{\text{g}}^{2 + }} < {\text{N}}{{\text{a}}^ + }\)</p>
<p>D. \({{\text{I}}^ - } < {\text{B}}{{\text{r}}^ - } < {\text{C}}{{\text{l}}^ - }\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">What is the correct electron configuration of the \({\text{C}}{{\text{u}}^ + }\) ion?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{9}}}{\text{ 4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{7}}}{\text{ 4}}{{\text{s}}^{\text{2}}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{{\text{10}}}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{8}}}{\text{ 4}}{{\text{s}}^{\text{1}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p class="p1">One respondent stated that the question should not have been asked, as students are not supposed to know the Cu exception. In the teacher’s notes of assessment statement 12.1.6 in the syllabus details it is clearly stated “exceptions to the principle for copper and chromium should be known”. 56.49% of the candidates chose the correct answer C, with 30.78% choosing A which means that about one-third of the schools do not teach these two exceptions.</p>
</div>
<br><hr><br><div class="question">
<p class="p1">What is the definition of electronegativity?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>The relative measure of the tendency of an atom when bonded in a molecule to attract a shared pair of electrons towards itself.</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>The minimum energy required to remove a mole of electrons from a mole of gaseous atoms.</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>The enthalpy change occurring in \({\text{kJ mo}}{{\text{l}}^{ - {\text{1}}}}\) when a gaseous atom gains one electron to form a negative ion.</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>The strength of an atom measured in \({\text{kJ mo}}{{\text{l}}^{ - {\text{1}}}}\) to attract an electron to itself when bonded in a molecule.</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which statements are correct for the oxides of period 3 going from Na to Cl?</p>
<p>I. The oxides become increasingly acidic.</p>
<p>II. The bonding of the oxides changes from ionic to covalent.</p>
<p>III. All the oxides dissolve readily in water.</p>
<p>A. I and II only</p>
<p>B. I and III only</p>
<p>C. II and III only</p>
<p>D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">The <em>x</em>-axis of the graph below represents the atomic number of the elements in period 3.</p>
<p class="p1" style="text-align: center;"><img src="images/Schermafbeelding_2016-09-25_om_11.26.20.png" alt="N10/4/CHEMI/HPM/ENG/TZ0/07"></p>
<p class="p1">Which variable could represent the <em>y</em>-axis?</p>
<p class="p1">A. Melting point</p>
<p class="p1">B. Electronegativity</p>
<p class="p1">C. Ionic radius</p>
<p class="p1">D. Atomic radius</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which species has the largest radius?</p>
<p class="p1">A. Cl<sup><span class="s1">–</span></sup></p>
<p class="p1">B. K</p>
<p class="p1">C. Na<sup><span class="s1">+</span></sup></p>
<p class="p1">D. K<sup><span class="s1">+</span></sup></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p class="p1">Though students did not find this question on particle radius particularly difficult (Difficulty Index 68%), it proved to be a poor discriminator (Discrimination Index 0.15) indicating that even good students find it difficult to apply a variety of trends simultaneously.</p>
</div>
<br><hr><br><div class="question">
<p class="p1">Which process is endothermic?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{2}}{{\text{C}}_4}{{\text{H}}_{10}}{\text{(g)}} + {\text{13}}{{\text{O}}_2}{\text{(g)}} \to {\text{8C}}{{\text{O}}_2}{\text{(g)}} + {\text{10}}{{\text{H}}_2}{\text{O(g)}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{Na(g)}} \to {\text{N}}{{\text{a}}^ + }{\text{(g)}} + {{\text{e}}^ - }\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({{\text{H}}_2}{\text{S}}{{\text{O}}_4}{\text{(aq)}} + {\text{2KOH(aq)}} \to {{\text{K}}_2}{\text{S}}{{\text{O}}_4}{\text{(aq)}} + {\text{2}}{{\text{H}}_2}{\text{O(l)}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{N}}{{\text{H}}_3}{\text{(g)}} \to {\text{N}}{{\text{H}}_3}{\text{(l)}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which property increases down group 17, the halogens?</p>
<p class="p1">A. Electron affinity</p>
<p class="p1">B. Boiling point</p>
<p class="p1">C. First ionization energy</p>
<p class="p1">D. Reactivity</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>What is the order of decreasing ionic radius?</p>
<p>A. S<sup>2−</sup> > Cl<sup>−</sup> > Al<sup>3+</sup> > Mg<sup>2+</sup></p>
<p>B. Cl<sup>−</sup> > S<sup>2−</sup> > Al<sup>3+</sup> > Mg<sup>2+</sup></p>
<p>C. S<sup>2−</sup> > Cl<sup>−</sup> > Mg<sup>2+</sup> > Al<sup>3+</sup></p>
<p>D. Mg<sup>2+</sup> > Al<sup>3+</sup> > Cl<sup>−</sup> > S<sup>2−</sup></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which compounds have an ionic lattice structure in the solid state?</p>
<p>I. Silicon dioxide</p>
<p>II. Sodium fluoride</p>
<p>III. Ammonium nitrate</p>
<p>A. I and II only</p>
<p>B. I and III only</p>
<p>C. II and III only</p>
<p>D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which equation best represents the first ionization energy of magnesium?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{Mg(s)}} \to {\text{M}}{{\text{g}}^ + }{\text{(s)}} + {{\text{e}}^ - }\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{Mg(g)}} \to {\text{M}}{{\text{g}}^{2 + }}{\text{(g)}} + {\text{2}}{{\text{e}}^ - }\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{Mg(g)}} \to {\text{M}}{{\text{g}}^ + }{\text{(g)}} + {{\text{e}}^ - }\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{Mg(s)}} \to {\text{M}}{{\text{g}}^ + }{\text{(g)}} + {{\text{e}}^ - }\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which statements about reactivity are correct?</p>
<p>I. Potassium reacts more vigorously than sodium with chlorine.</p>
<p>II. Lithium reacts more vigorously than potassium with water.</p>
<p>III. Fluorine reacts more vigorously than bromine with a potassium iodide solution.</p>
<p>A. I and II only</p>
<p>B. I and III only</p>
<p>C. II and III only</p>
<p>D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>The elements argon, potassium, and calcium are consecutive in the periodic table. Which gives the correct order of <strong>increasing</strong> first ionization energies?</p>
<p>A. \({\text{Ar}} < {\text{Ca}} < {\text{K}}\)</p>
<p>B. \({\text{K}} < {\text{Ar}} < {\text{Ca}}\)</p>
<p>C. \({\text{Ca}} < {\text{K}} < {\text{Ar}}\)</p>
<p>D. \({\text{K}} < {\text{Ca}} < {\text{Ar}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p>The most common wrong answer was C.</p>
</div>
<br><hr><br><div class="question">
<p class="p1">Which metals are considered to be transition elements?</p>
<p class="p1">I. Ti</p>
<p class="p1">II. Zn</p>
<p class="p1">III. Fe</p>
<p class="p1">A. I and II only</p>
<p class="p1">B. I and III only</p>
<p class="p1">C. II and III only</p>
<p class="p1">D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which electron configuration is that of a transition metal atom in the ground state?</p>
<p>A. [Ne]3s<sup>2</sup>3p<sup>6</sup>4s<sup>1</sup></p>
<p>B. [Ar]3d<sup>9</sup></p>
<p>C. 1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>4s<sup>2</sup>3d<sup>10</sup>4p<sup>2</sup></p>
<p>D. [Ar]4s<sup>1</sup>3d<sup>5</sup></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Each of the following oxides is added to separate equal volumes of distilled water. Which of the following is the most acidic oxide?</p>
<p class="p2">A. <span class="Apple-converted-space"> </span>\({{\text{P}}_{\text{4}}}{{\text{O}}_{{\text{10}}}}{\text{ }}\)</p>
<p class="p2">B. <span class="Apple-converted-space"> </span>\({\text{S}}{{\text{O}}_{\text{3}}}\)</p>
<p class="p2">C. <span class="Apple-converted-space"> </span>\({\text{C}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{7}}}\)</p>
<p class="p2">D. <span class="Apple-converted-space"> </span>\({\text{Si}}{{\text{O}}_{\text{2}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which statement about the elements in group 7 is correct?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{B}}{{\text{r}}_{\text{2}}}\) will oxidize \({\text{C}}{{\text{l}}^ - }\).</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({{\text{F}}_{\text{2}}}\) has the least tendency to be reduced.</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{C}}{{\text{l}}_{\text{2}}}\) will oxidize \({{\text{I}}^ - }\).</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({{\text{I}}_{\text{2}}}\) is a stronger oxidizing agent than \({{\text{F}}_{\text{2}}}\).</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which correctly describes the reaction between potassium and excess water?</p>
<p class="p1">A. The reaction is endothermic.</p>
<p class="p1">B. The final products of the reaction are potassium oxide and hydrogen.</p>
<p class="p1">C. The final products of the reaction are potassium hydroxide and hydrogen.</p>
<p class="p1">D. The final pH of the solution is 7.</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which oxides form acidic solutions when added to water?</p>
<p>A. \({{\text{P}}_{\text{4}}}{{\text{O}}_{{\text{10}}}}{\text{(s)}}\) and \({\text{S}}{{\text{O}}_{\text{3}}}{\text{(g)}}\) </p>
<p>B. \({\text{N}}{{\text{a}}_{\text{2}}}{\text{O(s)}}\) and \({\text{MgO(s)}}\)</p>
<p>C. \({\text{A}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{(s)}}\) and \({\text{Si}}{{\text{O}}_{\text{2}}}{\text{(s)}}\)</p>
<p>D. \({\text{MgO(s)}}\) and \({\text{A}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{(s)}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>X, Y and Z represent the successive elements, Ne, Na and Mg, but not necessarily in that order.</p>
<p style="text-align: center;"><img 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IM6tkO+6DdhKZYGlaI0aQWSzwnwifwAn30UZeuvYvDsvExkbr31FRm2esWtpugH9jU29p5KXN/Z2JVQPgmQgD0B8XsTPPXsmXDv9iAgvoir+8NZuCgGPmZ+jBOSY1mM468PRKAYpBq9C2fkQbuVn2DDuEiMe88D2nUH8P0tr9y5PTgqrRWO16z6um5Kaw/1IQESIAESUBABjf9QxAXtQeKhM5Cmfux064WAp/pCWhwqvvHSZx7SLce1EzA7spvLQElLNv4qgwCnLZRhB2pBAiRAArcHAfcoTMnYjkzLtIWlVY5TXPKlteLLvnKnI76WeAqLKP42PwFOWzS/DajBHUjAcQjwDkTAJpMACbQgAo7XLI48tCDjUVUSIAESIAESUAIBOg9KsAJ1IAESIAESIIEWRMBpwKQ4PME/EiCBxiXA86xx+VI6CZBA4xFw6jyI1XEZWeNBp2QScJw/JBESIAESUDIBx4cdTlso2VrUjQRIgARIgAQUSIDOgwKNQpVIgARIgARIQMkE6Dwo2TrUjQRIgARIgAQUSIDOgwKNQpVIgARIgARIQMkE6Dwo2TrUjQRIgARIgAQUSIDOgwKNUrNK4gdmOkLlPRYJhWXVs4ofmYlyR6uxu3G6rh8zrC6FKSRAAk1NoCIPOW+FIET63Ln4mfDe8J//D+RVyE/k6yj5cjISH20FMfpdpfJGh8lvY+EXJTDI9TUWIH+NTFbIdEw84pBHnr8yA4v9/oCQnB/lqdwmAZcE6Dy4RKPUA+bPynZJR1rCJmRVyi8sxTi+Kg7jDo7BrHlPIYDWVaoRqRcJ2BMw5mP3y08hIv+vGF98Q1oqX1U8BWPP6jDk1fetDwLG4mWY85fTyB/xOc5UCRCq9uFDr7cwL/gtrCuzXAuKcXzx43jk+CtYKeYRBFRt/T0qHx2LEUev2dcr7lV+go1JM/HR+furH2MKCbgiIH6S2/HP9JoHx1TuK4fATaHiSJQQDK3glXJEuCIpVikU7wgUtIgQdEeuKkdVauKUAM8xp1ju2MSqs/FCGPoKwdmldgzs08uEore7CAjbKHxWJctWtV9Y36+9rey1VGGaprdtX8p6Qcid4iFopuUKJdailcLlw5OE8T2XCF98Gee0fmtWbtzxBByvWXw2deVVKTpdA/cB67Fthy80SQuQcPQaxCeS10Z+BUPKHKQOaKdo7akcCZCAPQF191RkC8fxWdi99gekvRIUffcjjChF8bel0PTpDD/5lVvdGX8cZMCh/aehd1JanmQ4dQlF5gEK47lEhD/TBn1yXsXD7dzk2bhNArUSkHfBWjMzg5IItIHPX1OxOjoPWTMSMCZqEdKjd2B/4gB4KUlN6kICJHCLBIIw9NHOUBsv4dLXP7uUZXUMPJ9G5LyrOLTjn7bpjst78Y/0h6CbPwzB5qu+2nsC3rs4D/E+v3MpkwdIwBUBl6+ndlWA6QoioA7Es4umIrb/PGxCAuZmMM5BQdahKiRwawSM+Xg/ZQsOxKZjWbe7gIoiFBUagIdqE+uLfjM2Y23Y4+jjZgmj1EK77gC+l49KevjBvzZRPE4CLghw5MEFmJaRfB36w5/gH+JYpf4g9nypt4+4bhmNoJYkQALVCOhxbu0LGP7fU7Fyfj0fCiozsOShYVjx15O4IpgCJoWKDZj/6V/Q5+1vUFqtLiaQQP0J0HmoPzOFlDCgsnAmkqQ4h4+xf9E1nI5McB5NrRCNqQYJkEBdCOhxbs3j6D2hH8avnWSbVmjrB7+etQ0WG1H+5UbMLohHQpS/bQrTPQyRLwbg/CvbkWVdlVEXXZiHBJwToPPgnIvyUyuzsCYuDRlRG5CR8AQGT1iKpUHZyJrxjsPyTeU3hRqSAAmYCRgLcCQl1OQ4nHoDqT09bWjUndH5wbtt+w5bYiBlgPpfOJ6dD4OXyvEo3Dv64THDPmQd/cnhGHdJoP4E6DzUn1nzlzCeRm7yFCRejMOs16MwuK0acNfhpeU6BOctQ8LqfA5NNr+VqAEJ1IuA8fIqJA16EANznsGs0w6OgyTJC74PeMEaGGmRbryEf528Aa8HvOGBTugXHghNqWA5av41oPKHIhzQDIFuQHuHY9wlgfoToPNQf2bNXOI6Lu98AaNX9MbgLUmY7WuJlBaXb67AmjQvaJJeQ9S+y4x/aGZLsXoSqDOBygyseH4KFl+Mw9ytyUjuIRtxsArxQNeIUYg9sAQJ68yxC+JIxZIJePHzSZgd2Q0aaOAxcDJWD8pCVvp+29spK3OQuSkf9yx4FjpPXvatSLnRYALsRQ1G1xwFDag8Og6jhhfDkDIfGUN8YD8DqkX3uA1YHf0FcmNSsLD41+ZQknWSAAnUi0A5zr87B4mHDIA+FfM6tja/elp8/bTpv1XiAekdDmrfOEz7IBQR7z6EDuIxt1549OwYzDr4CsZbnAL3JxG3ZwOSkIJ5Hm4mGd12IGfUMRTM4FLuepmGmV0SUImvzXI8KnZYJ8mO2bhPAiTQQAI8xxoIjsVIgASahYDjNYsjD81iBlZKAiRAAiRAAi2XAJ2Hlms7ak4CJEACJEACzUKAzkOzYGelJEACJEACJNByCdB5aLm2o+YkQAIkQAIk0CwE7IP1ZSqIwRH8IwESaDwCPMcajy0lkwAJNC4Bl84DV1s0LnhKv7MJOEYu39k02HoSIAGlE3B82OG0hdItRv1IgARIgARIQGEE6DwozCBUhwRIgARIgASUToDOg9ItRP1IgARIgARIQGEE6DwozCBUhwRIgARIgASUToDOg9ItRP1IgARIgARIQGEE6DwozCC1qlOZgWWPtoIq5E1kVRqdZDegfF8ovFW90SfrO35Z0wkhJpFAiyRgzMfuGHdYPpJla4Me5z5JQKJ4XRA/luUdg8i9RSi1ZTBtGQuQvyYEIeaPbalCpmPikRJeIxw5cb9OBOg81AmTgjK56/DSch2C85YhYXV+9QtEZRbWzj+I0th52PpcJ4evbiqoHVSFBEigHgSu4/LOBLycft2hzHVcznwGvVM8cPe6H6UPGgrFUxCXGwr/xUdt1wdjPnaNDMEY1SpkCgIEoQTn4k7g9MBXMfHcLw4yuUsCtROg81A7I4Xl0MB9wFIsW+SG0qQFSDh6TaZfMY6vSkTixTjMmvcUAmhdGRtukkBLJWBAZeFMTI+uQpf+Dq/mKduClSO/gld0DGb38DQ1UB2AkPFP409JK5AsOQYGlOcm4fmdY5EQ5Q8vKZcWfs+vxZwp2Vi36bD0ue+WSod6Nw8B3l6ah/st1uqLfhOWYmlQNrJmvGOevjCg8mgips3qA92ehUj2/d0t1sHiJEACiiBQmYXUEZvxzTuvIbqtvUZGfQFOGfrAr9O9dqOMaq0/+mj2YM/nl2DEdzienQ9MGoKhnvJLfhc8trwMN5c+Bq29WO6RQK0E5D2p1szMoCACDtMXlZVZSJu0GwUpc5A6oJ2CFKUqJEACDSdgGk2c3fcdfKBzh1s9BKm8DCj9tgQVxkv418kb8Hrg97gqi41oFf0GVhWW1UMis5KAjQCdBxuLFrYlTl+sx7YdvtAkzUBMzERMb52C1JcDzcOSLaw5VJcESMCBgGk08cm/T8D2lc+is5OrtWmE4VeHcoA4IvG13pxcUYSiz6twY/kYhB54FjEHb0IQbuLqjO9w7KEZSC6uXr6aQCaQgAMBJ93RIQd3FUygDXz+morV0fnYvbs/dIv/Bp07Tapgg1E1EqgzAWPxQkwMuorgj8a5Pq89YzDx3btwaMFqpF02OQHGy5uxfPaH+FkWHyGOQvzUeTq2Lx0Cf+kSoYF7zwmIfXk7Fq06xJiHOluFGS0EeKexkGipv+r2aOflBmgDENzdo6W2gnqTAAnICRjz8X7Sm/hoQXIt05Bt4BP5Ac5MP4+jga2hUnnjvhUq3P/GVoxp4wavB7xhCZPQ9OkMP7srvhd8H/CC4dQlFDlb9S3Xh9sk4EDAris5HOMuCZAACZBAMxAwnt+MtdvKUZr0MDpY3svgFoqxuQYYlg2GtyoSCdYlllr4PbUdW0pMSzCvvBEDnWchij7vJgVSqj3DET6CDxbNYMbbuko6D7e1edk4EiCBlkhA3T0V2dL7GESHwPxftR8bB2ugmZaLEiETqd3vAoy52BD4B4Tk/GjXTDHm4SQioBvQHsB98OvvB7y5D3vK5EMMpfih6Cq8QvzNUxl2IrhDAjUSoPNQIx4eJAESIAEFE1AH4i8v3IO8lFRZzEMG3lmdjdLtL2K8tDSzDXyenIRFgW8ieY3lxXLXUfLFQryTFon4UX9ikLWCTaxU1eg8KNUy1IsESIAEaiXggW7jPsCxyDxk+YoxDyq4jfoap0f9Eyd0sjfMukchMftTbP01Fn2kaRB3dFrbG/1PLuY7YWplzAzOCKgEcUzM4U/sgE6SHXJxlwRIoKEEeI41lBzLkQAJNAcBx2sWRx6awwqskwRIgARIgARaMAE6Dy3YeFSdBEiABEiABJqDAJ2H5qDOOkmABEiABEigBROg89CCjUfVSYAESIAESKA5CNB5aA7qrJMESIAESIAEWjABh4/D21oiRlbyjwRIoPEI8BxrPLaUTAIk0LgEXDoPXKrZuOAp/c4m4Ljs6c6mwdaTAAkonYDjww6nLZRuMepHAiRAAiRAAgojQOdBYQahOiRAAiRAAiSgdAJ0HpRuIepHAiRAAiRAAgojQOdBYQahOiRAAiRAAiSgdAJ0HpRuIepHAiRAAiRAAgojQOdBYQapXR0DyveFwlv6Mp5K+oqeGAVr/98PITk/1i6KOUiABBRK4CIOTPV0OK/l57n8HNej6OMRiPE2H/eOQeTeIpQ6tMx4OQObXvU2y/RGh8lbkFX8q0Mu7pJA3QjQeagbJwXl0sBjyH6UCIL05VNxSa31v2Iv1j/fBggeifhH2itIZ6pCAiRQPwJd8NjyMtu5bTnPK7ZjycDW8EpJRWbYvQCu43LmM+i1pBPuz70GQbiJitz70XlRH/gvPmpzICozsCziRaz885e4Kcn6Fl89nIoRUauRVWmsn2rMTQIA6DzcNt2gGMdXxWHcweGIT42Fzp2mvW1My4aQgERAPMcTMb11ClJfDoSXmFa2BStH/oKgOVOQ3MMTgAbuPSbjhRhflK76AFllomNgQPmXGzG7IB5xYR1herlPG/iEj8GkI5uRdvgn8iWBehNw+ZKoektigWYkID59DMPTs9ohIPM1rOwpXkT4RwIkcPsQMKDyaCKmzfoPBGePtj0ceMZj6c34W2jmWRR99yMMuNfsVNyCKBa9owjw8fQ2MLexeBleG/kVDFNXYPtznXgRuA1syiaQgB0B41fISfsQh2JnYmWoOF3h6u86Sr6YiIUvuyFgZRzGe4qXeA08Bo7FQv80rM35AQap6HWUHN2Lzfe8jpVR3XjNcIWT6S4JcOTBJZoWcqAyAyuiFmFT0FJkzg2FP93BFmI4qkkCdSdgPL8Za9O7Iyj7LwhwcY4bzyXgiR5pyBHdhdGrkf6I1uYUuEdh2nuHcKBHZ7SyVqtD/NlXbKMY1nRukEDtBFx0w9oLMocSCJjmQBMvxmHu1gReBJRgEupAAr85gXJcOJiNnFoCodXdU5EtBkNWncKnHRZhROBkJEurKcQpjxEY1PsXdC0QgyrFIOubqCjQouzBl5BQWPaba0yBtz8BleDkC1j8aE9LMLwY5xCCwOH/hlfmxzih43RFS7CaRUeeYxYS/K2VgDEXG0MjMCfqa3w/rrttNKGmgmVpSLx3IralfYPica2QN/UhhKv34Pulj0FrLScuB3WWbs3ADRKwEnC8ZnHkwYqmZW1Y4xxSNmA/HYeWZTxqSwL1IGA8vxuZn/WCX6f6BTWqvAwo/bYEFWXZyN5e7qRGL/g+4AXDtv3YI63KcJKFSSTgggCdBxdgFJ1sjnNIj9qAjATzki1FK0zlSIAEGkbAPGWhDYNuQPV3t4hxDuEq+QujbLUIpb0RFBoAT89whI/wsB2wbpWi+NtSaEaFYqgUWGk9wA0SqJUAnYdaESktg75j1vIAAAGFSURBVC3OYdbrURjcliZUmoWoDwn8dgRMN3j07oqeTs51dfckLFr0vzi0bS9yK8wvezKeRu6ChXgzagpmDxQdjk7oHzsGEds+xMJPzplfHGVAZeEqbF75CIY+95BsKuO305ySbm8CvPO0NPuWfYis1cWAPhXzOrZ2+fraVokHoG9pbaO+JEAC9STgi34zPsWhsL1I93MzXQ/cpmFhp83Ylzra/HChgXvPFdi2rxsezHkMHaTX2bfCPYs7od+p95A5oF0962R2EgAYMMleQALNQMAx+KgZVGCVJEACJFBnAo7XLI481BkdM5IACZAACZAACYgE6DywH5AACZAACZAACdSLAJ2HeuFiZhIgARIgARIgAToP7AMkQAIkQAIkQAL1IuDy2xZicAT/SIAEGo8Az7HGY0vJJEACjUvAqfPg5I3VjasFpZMACZAACZAACbQYApy2aDGmoqIkQAIkQAIkoAwCdB6UYQdqQQIkQAIkQAIthgCdhxZjKipKAiRAAiRAAsog8P+MdL43XUNc8QAAAABJRU5ErkJggg=="></p>
<p>What is the order of increasing atomic number?</p>
<p>A. X < Y < Z</p>
<p>B. X < Z < Y</p>
<p>C. Y < Z < X</p>
<p>D. Y < X < Z</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br>