Pearson Edexcel IAL Chemistry 2.14 Electronic configurations

Practise writing and recognising electronic configurations for atoms and ions using s, p, d notation and electron-in-box diagrams.

Exam points

write full or shorthand s, p, d configurations for atoms and ions up to krypton
select electron-in-box diagrams that match ground-state filling and spin rules
remove 4s electrons before 3d when forming transition-metal ions

[Maximum number: 1]

This question is about the element calcium and some of its compounds.

Give the complete electronic configuration, using s, p, d notation, of a calcium atom in the ground state.

An answer that makes reference to the following point:

- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}$

Accept correct electrons-in-boxes notation

Accept expansion of p -subshell(s), eg $2 \mathrm{p}_{\mathrm{x}}{ }^{2} 2 \mathrm{p}_{\mathrm{y}}{ }^{2} 2 \mathrm{p}_{\mathrm{z}}{ }^{2}$ for $2 \mathrm{p}^{6}$

Allow non-superscript numbers for electrons

Ignore use of commas and spaces

Ignore 2,8,8,2

Ignore [Ar] for $1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6}$

Do not award incorrect order of subshells

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2.14—Predict the electronic configuration of atoms of the elements from hydrogen to krypton inclusive and their ions question 1