Question

why mg atom gets positive 2 charge when it loses two electrons

Answer 1

Magnesium,Mg, is a metal i.e electropositive so it will always tend to lose its 2 valence electrons to attain stable electronic configuration of nearest noble gas. As a result, magnesium atom becomes cation (positively charged ion) since it will have 12 protons and 10 electrons after losing its 2 valence electrons and we know that the charge of ion depends on no. of protons and electrons.

Answer 2

Here is your answer-

The elements loss there electrons to complete their octet state is called metals. Metals carry positive charge. So, it form cation. Therefore, Metals are electro-positive.

The elements gain there electrons to complete their octet state is called non metals. Non-metals carry negative charge. So, it form anion. Therefore, Nonmetals are electro-negative.

Atomic number of magnesium is 12. It's electronic configuration is 2,8,2. To complete it's octet state it will lose it's 2 electron and form Mg++ .

That's why Magnesium carry 2 positive charge when it lose it's electron.

Hope it helps..!
Pls Mark it as a Brainlist...