CAIE IGCSE Chemistry Electronic Configurations of Atoms and Ions

Practise deriving shell configurations for atoms and ions up to calcium, adjusting electron totals for charge and comparing isoelectronic particles.

Exam points

use proton number to write an atom's shell configuration for elements from hydrogen to calcium
subtract electrons for positive ions or add them for negative ions before filling the shells
compare electron totals and configurations to identify particles that are isoelectronic

[Maximum number: 1]

This question is about elements X, Y and Z.

An atom of element X is represented as ${ }_{16}^{34} \mathbf{X}$ .

What is the electronic structure of the ion $\mathbf{X}^{2-}$ ?

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