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 full and shorthand electron configurations, selecting ground-state box diagrams and determining orbital occupancy for atoms and ions using Edexcel IAL Chemistry evidence.

Exam points

Write full or shorthand s, p, d configurations for atoms and ions up to krypton.
Select electron-box diagrams matching ground-state filling and spin rules.
Determine electron counts and configurations for ions, including transition-metal ions, from atomic number and charge.

[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