The correct answer for this question is option 'D' which states that the bond between two identical nonmetallic atoms has a pair of electrons equally shared between them. Let's delve into the details to understand why this answer is correct.

What is a bond between two nonmetallic atoms?
A bond is formed between atoms when they share, donate, or receive electrons to achieve a stable electron configuration. In the case of nonmetallic atoms, they tend to form covalent bonds by sharing electrons.

Covalent Bonding
Covalent bonding occurs when two atoms share a pair of electrons to achieve a more stable electron configuration. This sharing allows both atoms to fill their outermost energy levels, usually the valence shell.

Identical Nonmetallic Atoms
When two identical nonmetallic atoms come together to form a covalent bond, they have the same electronegativity. Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. In the case of identical nonmetallic atoms, their electronegativity values are equal.

Electron Sharing in Identical Nonmetallic Atoms
In a covalent bond between identical nonmetallic atoms, the pair of electrons is equally shared between them. This means that neither atom has a stronger pull on the electrons than the other. As a result, the electrons spend an equal amount of time around both atoms.

Equal Sharing of Electrons
The equal sharing of electrons in a covalent bond between identical nonmetallic atoms ensures that both atoms have an equal contribution to the bond. This equal sharing leads to a balanced distribution of charge and a stable bond.

Importance of Identical Spins
The option 'C' mentions "with identical spins." In a covalent bond, the electrons involved have opposite spins, which is known as spin pairing. This pairing ensures that the electrons occupy the same orbital but with opposite spins, abiding by the Pauli Exclusion Principle.

Therefore, the correct answer is option 'D' which states that the bond between two identical nonmetallic atoms has a pair of electrons equally shared between them.

The bond between two identical non-metallic atoms has a pair of electrons:
Detailed Explanation:
1. Covalent Bond:
- The bond between two identical non-metallic atoms is a covalent bond.
- In a covalent bond, atoms share electrons to achieve stability.
2. Electron Pair:
- The bond between two identical non-metallic atoms involves a pair of electrons.
- This means that both atoms contribute one electron to the bond, resulting in a shared pair of electrons.
3. Equally Shared:
- In the case of identical non-metallic atoms, the pair of electrons is equally shared between the atoms.
- This means that both atoms have equal ownership of the shared pair of electrons.
4. Electronegativity:
- Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond.
- In the case of identical non-metallic atoms, their electronegativity values are typically similar.
- When electronegativity values are similar, the electrons in the bond are shared equally.
5. Lewis Structure:
- The Lewis structure of a molecule can be used to represent the sharing of electrons in a covalent bond.
- In the Lewis structure, a pair of electrons is represented by a single line (-) between the atoms.
Conclusion:
- The bond between two identical non-metallic atoms has a pair of electrons that are equally shared between the atoms.