A LevelChemistryCIETopic Questions9. The Periodic Table: Chemical Periodicity9.3 Chemical Periodicity of Other Elements

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First teaching 2023

First exams 2025

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Chemical Periodicity of Other Elements (CIE A Level Chemistry)

Topic Questions

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11 mark

Element G reacts with chlorine to form a chloride. This reacts with water to form an acidic solution. 

Which group in the Periodic Table is G in? 

  • Group 1

  • Group 2 

  • Group 5

  • Group 6

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21 mark

Element Z reacts with oxygen to form an oxide that is a solid at room temperature and pressure. The oxide formed can react with both acids and bases.

What could be the identity of Z?

  • Si

  • Mg

  • Cl

  • Al

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31 mark

Element X forms an oxide with a high melting point of 1710 °C. The oxide reacts with NaOH (aq). 

What is the identity of X?

  • Si

  • Na

  • Cl

  • S

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11 mark

The successive ionisation energies of elements X and Y are shown below.

Element X

IE

1st

2nd

3rd

4th

5th

6th

7th

8th

IE (kJ mol-1)

590

1145

4912

6491

8153

10496

12270

14206

 

Element Y

IE

1st

2nd

3rd

4th

5th

6th

7th

8th

IE (kJ mol-1)

1012

1907

2914

4964

6274

21267

25431

29872

 

X and Y form ions with the same electron configuration as argon.

What are the identities of elements X and Y respectively?

  • Calcium and phosphorus 

  • Sodium and oxygen

  • Magnesium and nitrogen

  • Phosphorus and potassium 

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21 mark

G and J are oxides of different Period 3 elements.

If one mole of J is added to water, the solution formed is neutralised by exactly one mole of G.

What could be the identities of G and J? 

  G J
A Na2O SO3
B Na2O P4O10
C Al2O3 SO3
D Al2O3 P4O10

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31 mark

An element Z has the same oxidation state as a common iron ion but the Z ion has the same number of electrons as Ne . An oxide of element Z reacts with a strong acid to produce a chloride salt but does not dissolve in water.

What is the correct identity of element Z?

  • Magnesium

  • Silicon

  • Sodium

  • Aluminium

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11 mark

The period 4 elements gallium (Ga), germanium (Ge), arsenic (As) and selenium (Se) are the elements directly below aluminium, silicon, phosphorus and sulfur in the Periodic Table.

The properties of each period 4 element resemble those of the period 3 element directly above it. 

Which period 4 elements form oxides that dissolve in water to give an acid solution?

  • Ga and Ge

  • Ga and Se

  • As and Se

  • Se only

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21 mark

Elements X and Y react together to form compound Z. Elements X and Y are both in Period 3. Element X has the second smallest atomic radius in Period 3. Apart from argon, there is only one element in Period 3 which has a lower melting point than element Y.

Which compound could be Z?

  • Na2S

  • MgS

  • MgCl2

  • PCl3

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31 mark

Compound X readily conducts electricity when added to water to produce a solution but does not conduct electricity in its liquid state.

Which of the following could X be?

1

MgCl2

2

PCl3

3

SiCl4

  • 1, 2 and 3

  • 1 and 2

  • 2 and 3

  • 1 only

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