Fluorine (f) has seven electrons in its outermost shell. fluorine
is a metal
is a nonmetal
fills its shell by giving up seven electrons
fills its shell by gaining one electron
becomes a positively charged ion
becomes a negatively charged ion

Option (b) is the correct answer.

Explanation:

Non-metals are the species that tend to gain electrons in order to complete their octet.

For example, atomic number of fluorine is 9 and its electronic distribution is 2, 7.

So, in order to completely fill its octet it needs to gain an electron. Hence, it means it is a non-metal.

Whereas elements that tend to lose electrons in order to attain stability are known as metals.

For example, atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1. Hence, to attain stability it loses its 1 valence electron.

Thus, we can conclude that fluorine (F) has seven electrons in its outermost shell. Fluorine is a non-metal.