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CAIE A-Level Chemistry 9.3 Chemical Periodicity of Other Elements

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

9.3 Chemical periodicity of other elements question 1

[Maximum number: 1]

The element astatine, At, is below iodine in Group 17 of the Periodic Table.
Which statements concerning At are likely to be correct?

1 It is a dark-coloured solid at room temperature.
2 It is a more powerful oxidising agent than iodine.
3 Its hydride is more thermally stable than HBr .

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

9.3 Chemical periodicity of other elements question 2

[Maximum number: 1]

X, Y and Z are elements all found within Groups 13, 14 and 15 of the Periodic Table.
X is in the same group in the Periodic Table as Y .

Y and Z are in Period 3.

The first ionisation energy of X is greater than the first ionisation energy of Y.
The melting point of Z is less than the melting point of Y.
Y and Z both form chlorides which are white solids. These white solids react with water to produce solutions with a pH of less than 4.

Which row of the table shows the possible identities of X and Y ?

X

Y

B

Al

Ge

Si

As

P

N

P

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