WBCS.LIVE practice question

The magnesium ion (Mg2+>) is strictly isoelectronic with which of the following chemical species?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Ca2+
  2. Na+
  3. Cl-
  4. K+

Correct answer and explanation

Correct answer: Na+

Explanation: āœ… Correct Answer: B) Na+ šŸ“š Explanation: Isoelectronic species are atoms or ions that possess the exact same total number of electrons. A neutral magnesium atom (Atomic number 12) has 12 electrons, but Mg2+ has lost two, leaving it with 10 electrons. Similarly, a neutral sodium atom (Atomic number 11) has 11 electrons, but Na+ has lost one, also leaving it with exactly 10 electrons.