Answer: A-: Mg BELONGS TO Group 2, B:- O belongs to Group 16 and C-: Fe belongs to Group 8
Step-by-step explanation:
A - Mg:
Electronic distribution: 1s² 2s² 2p⁶ 3s²
Group in the periodic table: Magnesium (Mg) belongs to Group 2 (or Group IIA), also known as the alkaline earth metals group.
B - O:
Electronic distribution: 1s² 2s² 2p⁴
Group in the periodic table: Oxygen (O) belongs to Group 16 (or Group VIA), also known as the chalcogens.
C - Fe:
Electronic distribution: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
Group in the periodic table: Iron (Fe) belongs to Group 8 (or Group VIIIB), also known as the transition metals.