Question

classifying nonmetals by group
identify whether each element is a halogen, a noble gas, or nonmetal only.
astatine (at):
nitrogen (n):
krypton (kr):
chlorine (cl):
sulfur (s):

Explanation:

Astatine (At)

Halogens are in Group 17 of the periodic table. Astatine (At) is in Group 17, so it is a halogen.

Nitrogen (N) is a nonmetal but not a halogen (Group 17) or noble gas (Group 18). It is in Group 15, so it is a nonmetal only.

Noble gases are in Group 18. Krypton (Kr) is in Group 18, so it is a noble gas.

Answer:

halogen

Nitrogen (N)