How does an atom become a positive ion? a negative ion?

So ions are atoms that have either gained or lost electrons to complete their energy levels.

In order for a positive ion to be formed, an atom must lose electrons.

In order for a negative ion to be formed, an atom must gain electrons.

When an atom loses and electron, it loses a negative charge and then becomes a positive ion.

answer; i do believe the correct answer is (river); /// good luck

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