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CAIE A-Level Chemistry AS 9.3 Chemical Periodicity of Other Elements Questions

Practise using periodic position and nearby-element data to predict properties of less familiar elements and compounds.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use group position to predict common ion charge, formula patterns and chemical similarities
  • interpolate numerical properties cautiously from neighbouring elements and identify a defensible range
  • combine period and group trends to identify an unfamiliar element from ionic radius or reaction evidence

Covered syllabus points

9.3.1—The characteristic properties of an element9.3.2—The nature, possible position in the Periodic

Question 1

[Maximum number: 1]

Which row shows the expected properties of the element astatine when compared to the properties of the element iodine?

electronegativity of astatine compared to iodine

volatility of astatine compared to iodine

less electronegative

higher

more electronegative

higher

less electronegative

lower

more electronegative

lower

Question 2

[Maximum number: 1]

X and Y are two elements from Period 3 of the Periodic Table.
Element X has a higher electrical conductivity than element Y . Element Y has a higher melting point than element X .

Which formula is a compound formed from element X and element Y ?

A

MgS

B

Mg2Si\mathrm{Mg}_{2} \mathrm{Si}

C

NaCl

D

SiCl4\mathrm{SiCl}_{4}

Question 3

[Maximum number: 1]

Scientists are trying to synthesise a new element with proton number 119. The element is predicted to be a Group 1 element in Period 8 of the Periodic Table.

Which predictions are likely to be correct about this element?
1 The outermost occupied orbital of one atom of this element will be an s orbital.
2 The atomic radius will be the largest of the seven elements in Group 1.
3 It will have a greater first ionisation energy than element 118.

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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