This gas is neon.
Noble gases are, for all intents and purposes, unreactive - there are a few noble gas compounds but you have to really work at it to convince noble gases to form bonds. Fluorine is an extremely reactive gas, hence it is not a noble gas. It is a halogen - the most reactive halogen of them all.
Neon
Fluorine attains the electron configuration of neon (the nearest noble gas).
[He]2s22p5
Neon
Noble gases are, for all intents and purposes, unreactive - there are a few noble gas compounds but you have to really work at it to convince noble gases to form bonds. Fluorine is an extremely reactive gas, hence it is not a noble gas. It is a halogen - the most reactive halogen of them all.
Argon (Ar) is the nearest noble gas to potassium.
Neon
fluorine- it is a gas
Fluorine attains the electron configuration of neon (the nearest noble gas).
halogens
[He]2s22p5
The element with a mass number of 19 could be fluorine, which is a halogen and a gas, but not a noble gas.
fluorine- it is a gas
Neon
The noble gas nearest to Phosphorus (P) is Argon (Ar).
Argon is a noble gas. It is not a halogen. Fluorine is a example for that.