JAMB - Chemistry (2025 - No. 79)
Atom with the electron configuration of 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\) belongs to
Group 3 and Period 2
Group 8 and Period 3
Group 2 and Period 3
Group 2 and Period 6
Explanation
Magnesium (Mg) belongs to Group 2 (the Alkaline Earth metals) and Period 3 of the periodic table, meaning it has 2 valence electrons and three electron shells, placing it in the s-block.
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