In the equation for the formation of magnesium sulfide shown, which atom gains electrons?
mg + s → mgs

S + 2e⁻ → S²⁻ (sulfur will gain electrons)

Mg - 2e⁻ → Mg²⁺ (magnesium will lose electrons)

Magnesium is a metal which tends to give electrons which are received by the sulfur, which is a nonmetal and tends to gain electrons.

there is none because earth is stationary and flat.