The atomicity of neon gas is:

(A) Two

(B) One

(C) Four

(D) Three

Properties of Neon

• Neon is a p-block element, belonging to period 2 and group 18 of the periodic table.
• Its atomic number is 10, meaning it contains 10 protons and 10 electrons.
• At room temperature, neon exists in the gaseous state.

Electronic Configuration

• The electronic configuration of neon is 1s² 2s² 2p⁶.
• This shows that its outer shell contains 8 electrons, completing its octet.
• Because the octet is complete, neon is chemically stable and does not readily gain, lose, or share electrons.
• As a result, it does not form bonds with other atoms.

Nature of Neon

• Neon exists as a monatomic gas (atomicity = 1).
• It is a latent, colorless, odorless, and non-toxic noble gas.
• Under normal conditions, all noble gases (including neon) exist in a monatomic state.

From the above explanation, the correct answer is Option B.