Edexcel A-Level Chemistry AS 2.14 Predict the Electronic Configuration of Atoms of the Elements From Hydrogen to Krypton Inclusive and Their Ions Questions

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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Edexcel A-Level Chemistry AS 2.14 Predict the Electronic Configuration of Atoms of the Elements From Hydrogen to Krypton Inclusive and Their Ions Questions question 1