Question

correct the false sentences from the part a. the $\ce{mg^{2+}}$ ion contains 12 protons and 14 electrons. the $\ce{mg^{2+}}$ ion contains 12 protons and 10 electrons. the $\ce{mg^{2+}}$ ion contains 14 protons and 10 electrons. the $\ce{mg^{2+}}$ ion contains 12 protons and 12 electrons.

Explanation:

Step1: Determine the number of protons in Mg²⁺

The atomic number of Mg is 12. The number of protons in an atom or ion is equal to its atomic number. So, the number of protons in Mg²⁺ is 12.

Step2: Determine the number of electrons in Mg²⁺

The charge on Mg²⁺ is +2. For a neutral Mg atom, the number of electrons is equal to the number of protons (12). When it forms Mg²⁺, it loses 2 electrons. So, the number of electrons is \(12 - 2=10\).

Answer:

The \(Mg^{2 + }\) ion contains 12 protons and 10 electrons.