Question

what is the name of the alkali metal that is in period 4? what is the name of the halogen that is in period 4? what is the name of the alkaline earth metal that is in period 3? what is the name of the noble gas that is in period 1?

Explanation:

Alkali metals are in Group 1 of the periodic table. The alkali - metal in period 4 is potassium. Halogens are in Group 17. The halogen in period 4 is bromine. Alkaline earth metals are in Group 2. The alkaline earth metal in period 3 is magnesium. The only noble gas in period 1 is helium.

Answer:

Potassium
Bromine
Magnesium
Helium