Question

what ion is formed when an atom of mercury (hg) loses two
hg⁻¹
hg⁻²
hg⁺¹
hg⁺²

Explanation:

Step1: Understand ion - formation concept

When an atom loses electrons, it forms a positive ion (cation). The charge of the ion is equal to the number of electrons lost.

Step2: Determine charge of mercury ion

Mercury (Hg) loses two electrons. So the charge of the ion formed is + 2.

Answer:

Hg$^{+2}$