It is a ion of oxygen and has charge of -2 it gain electrons so electronic configuration is 2,8

Electronic Configuration of O^2-

The electronic configuration of an atom describes the arrangement of electrons in its energy levels or shells. In the case of O^2-, we need to consider the oxygen atom gaining two extra electrons to form an anion with a charge of -2. To determine the electronic configuration of O^2-, we can follow the general rules of electron filling:

1. Identify the atomic number of oxygen: Oxygen (O) has an atomic number of 8, meaning it has 8 protons and 8 electrons in its neutral state.

2. Determine the number of electrons gained: O^2- has gained two electrons, resulting in a total of 10 electrons.

3. Fill the energy levels: Electrons fill energy levels starting from the innermost shell and moving outward. The first energy level (K shell) can hold a maximum of 2 electrons, the second (L shell) can hold up to 8, and the third (M shell) can hold up to 18.

The electronic configuration of O^2- can be represented as follows:

K shell (1s): 2 electrons
L shell (2s, 2p): 8 electrons
M shell (3s, 3p, 3d): 10 electrons

Detailed Explanation:

1. K shell (1s): The first shell can hold a maximum of 2 electrons. Since oxygen has 8 electrons in its neutral state, the first 2 electrons occupy the 1s orbital.

2. L shell (2s, 2p): The second shell can hold up to 8 electrons. After filling the 1s orbital, there are 6 remaining electrons. Two of these electrons occupy the 2s orbital, and the remaining 4 electrons occupy the 2p orbitals (2px, 2py, 2pz).

3. M shell (3s, 3p, 3d): The third shell can hold up to 18 electrons. In the case of O^2-, there are 10 electrons remaining after filling the 1s and 2s/2p orbitals. Therefore, two electrons occupy the 3s orbital, and the remaining 8 electrons occupy the 3p orbitals (3px, 3py, 3pz).

The electronic configuration of O^2- can be summarized as follows:

1s^2 2s^2 2p^6 3s^2 3p^6

Visually Appealing Representation:

Electronic Configuration of O^2-
- K shell (1s): 2 electrons
- L shell (2s, 2p): 8 electrons
- M shell (3s, 3p, 3d): 10 electrons

Detailed Explanation:
1. K shell (1s): 1s^2
2. L shell (2s, 2p): 2s^2 2p^6
3. M shell (3s, 3p, 3d): 3s^2 3p^6

Summary:
Electronic configuration of O^2-: 1s^2 2s^2 2p^6 3s^2 3p^