Question

Which ion at ground state has the same electron configuration as an atom of neon at ground state?

1. Ca^2+
2. CI^-
3. Li^+
4. O^2-

Answer 1

Oxygen, as the O2- anion, has the same electron configuration as neon because it gains two electrons resulting in a full octet, identical to neon's stable electron configuration.

Step-by-step explanation:

The ion at ground state that has the same electron configuration as an atom of neon at ground state is O2-. Neon has an electron configuration of 1s22s22p6, which totals 10 electrons, giving it a complete octet and making it energetically stable. Oxygen, which has an electron configuration of 1s22s22p4 at ground state, can gain two electrons to become O2-, thereby achieving the same stable electron configuration as neon, [Ne]. This process of an atom gaining electrons to achieve a noble gas configuration is common in nonmetal atoms as they form anions.

Answer 2

4. O^2-

Step-by-step explanation:

O^2 has 16 electrons, while Ne has 18 electron. O^2- is a molecule that has one electrons added to each atom, meaning that there are two extra electrons. Which makes O^2 the same electron configuration as an atom of neon.