Explaining the trend in the reactivity of the halogens

3 marks · Easy

This question is about the properties of the halogens.

(a)

What is the formula of the ion formed when iodine forms an ionic salt?

[1 mark]

(b)

Describe the colour and state of iodine at room temperature.

[2 marks]

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(a) I−

(b) Purple-black solid · must show Purple-black, Solid

Common mistakes: I2−; I+

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Marking points

B1 (a) · 1 mark · States correct ion formula: I−.

B2 (b) · 1 mark · States colour as purple-black (or similar).

B3 (b) · 1 mark · States state as solid.

Worked solution

a) I− b) Purple-black solid