DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ1.1e(iii)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ1.1e(iii)
Level hl Paper 2 Time zone TZ1
Command term Determine, Justify Question number e(iii) Adapted from N/A
e(iii).
[Maximum mark: 1]
22M.2.hl.TZ1.1e(iii)

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

Most nitride ions are 14N3–.

(e(iii))

The nitride ion and the magnesium ion are isoelectronic (they have the same electron configuration). Determine, giving a reason, which has the greater ionic radius.

[1]

Markscheme

nitride AND smaller nuclear charge/number of protons/atomic number ✔

Examiners report

There was reference to nitrogen and magnesium, rather than nitride and magnesium ions. Also, instead identifying smaller nuclear charge in nitride ion, some referred to core electrons, Zeff, increased electron-electron repulsion or shielding.

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