Other examples of ionic bonding

4 marks · Normal

Iodine (I) is in Group 7 of the periodic table.

(a)

How many electrons does an iodine atom gain or lose to form an ion?

[1 mark]

(b)

What is the charge on an iodide ion?

[1 mark]

(c)

Write the electron configuration of the iodide ion.

[1 mark]

(d)

Name the noble gas that has the same number of electrons as the iodide ion.

[1 mark]

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(a) Iodine atom gains 1 electron.

(b) 1–

(d) Xenon

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Marking points

B1 (a) · 1 mark · States iodine gains 1 electron

B2 (b) · 1 mark · States charge on iodide ion is 1– or I–

B3 (c) · 1 mark · Gives correct electronic configuration: [2, 8, 18, 18, 8]

B4 (d) · 1 mark · Gives noble gas name: xenon

Worked solution

a: Iodine gains 1 electron.

b: The charge is 1–.

c: Electron configuration is [2, 8, 18, 18, 8].

d: The noble gas is xenon.