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Paper 3 · June 2009 · Atomic Structure and Bonding

Which ion contains an unpaired electron?

A

Ca^{2+}

B

Cu^{2+}

C

K^+

D

Ti^{4+}

Explanation

The marking scheme gives answer B.

Cu^{2+}

has electron configuration [Ar]

3d^9

, which has one unpaired electron in the 3d subshell.

ZIMSEC Chemistry Paper 3, June 2009, Q5

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