Which protects nerve endings at the ends of fingers and toes?

Nails

Explanation: The fingernails and toe nails protect the nerve endings  at the ends of the finger and toes. It acts as the counter force when the ends of the finger of hands or toes touches an object by increasing the sensitivity of the fingertips.

Although it has no nerve endings o its own but it protect the nerve endings present in the fingers and toes.

It acts as the tool for gripping the objects more efficiently.

helium

oxygen

neon

sodium