Question

Statement A: Magnesium and Magnesium ions have the same number of electrons.

Statement R: Magnesium and magnesium ions have same nuclear charge.

• A. If 'A' and ‘R’ are true and 'R' is the correct reason for 'A'.
• B. If 'A' and ‘R’ are true but 'R' is not the correct reason for 'A'.
• C. If 'A' is correct and 'R' is wrong.
• D. If 'A' is wrong and ‘R’ is correct.

Answer 1

The correct option is D

If 'A' is wrong and ‘R’ is correct.

• The atomic number of Magnesium is 12 and its electronic configuration is 2, 8, 2.
• On the formation of magnesium ion, it loses 2 electrons to form ${\mathrm{Mg}}^{+2}$ ion. The electronic configuration of Magnesium ion is 2, 8.
• So, both Magnesium and Magnesium ions have a different number of electrons.
• But they both contain the same number of protons. Hence, the nuclear charge acting on both Magnesium and Magnesium ion is the same.
• Hence, 'A' is wrong and ‘R’ is correct.
• Hence option D is correct.