i. Ca2+
ii. Fe3+
iii. Fe2+
iv. Al3+
Solutions
1. Ca²+ = 1s² 2s² 2P6 3s² 3P6
2. Fe³+ = 1s² 2s² 2P6 3s² 3p6 3d5
3. Fe²+ = 1s² 2s² 2p6 3s² 3p6 3d6
4. Al³+ = 1s² 2s² 2p6
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