What is the net ionic charge of an oxygen ion? a+3 b-3 c-2 d-1

Answer : The correct option is, (c) (-2) charge

Explanation :

For the neutral atom, the number of protons and electrons are equal. But, they are unequal when the atoms present in the form of ions or the atom has some charges.

When an unequal number of electrons and protons then it leads to the formation of ionic species.

Ion : An ion is formed when an atom looses or gains electron.

When an atom looses electrons, it will form a positive ion known as cation.

When an atom gains electrons, it will form a negative ion known as anion.

The neutral atom oxygen has equal number of protons and electrons i.e 8.

The electronic configuration of oxygen atom is:

As we know that oxygen has tendency to gain 2 electrons and become stable by fully filled electronic configuration.

By gaining of 2 electrons, an oxygen will form a negative ion i.e,

Thus, the net ionic charge of an oxygen ion is, (-2)

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8