Krypton is named after the greek word that means “secret.” which explains why krypton was most likely given this name? krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself. krypton is a halogen, so it should be kept secret because it is so reactive and toxic. krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret. krypton is a noble gas, so it secretly bonds with every type of element without showing it.

Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret

Explanation:

Krypton  is a noble gas and this demand it has full orbital electron shells (2.8.18.8 or [Ar].3d¹⁰.4s².4p⁶). They, therefore, do not have an affinity for gaining or losing an electron hence rarely react with other elements. They were therefore hard to discover by early chemists because there were no known compounds of this gas and other noble gases. This is why the name ‘hidden’.

the answer is

c. parental

the answer is d (apex) good luck : ))