What happens to an atom when it gains two extra electrons​

if the element A gains 2 electron then the element A get 2units of negative charge means it have the 2 excess of electrons or it get 2units of negatively charged particle.

hence, it get negatively charged

Explanation:

When atom A gains two electrons it forms an anion by developing 2 negative charges over it as there are 2 electrons more than the number of protons in the ion.

dynamic equilibrium is the answer.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l