Is it true that the valency of neon is zero?

The statement "the valency of neon is zero" is absolutely correct. Let's break down why.

Neon is a noble gas with an atomic number of 10. This means it has 10 electrons in total, which are arranged in its electronic configuration as 2, 8. The first shell holds 2 electrons, and the second shell holds 8 electrons. This arrangement is crucial in understanding the valency of neon.

The key reason why the valency of neon is zero is because the outermost shell (the second shell) is completely filled with 8 electrons, which is the stable configuration for most elements. When the outer shell is fully filled, the atom does not have a tendency to gain, lose, or share electrons in chemical reactions. This makes neon chemically inert.

Since neon is already in its most stable form, it does not form bonds with other elements, meaning it doesn't have the ability to donate, accept, or share electrons. This is why the valency of neon is considered to be zero.

To summarize, the valency of neon is zero because it has a complete outer electron shell and is chemically stable on its own. It doesn't engage in bonding or reactions like other elements with incomplete outer shells.