Question

which is an alkali metal? *

magnesium (mg)

iron (fe)

sodium (na)

europium (eu)

Explanation:

Alkali metals are in Group 1 of the periodic table. Sodium (Na) is in Group 1. Magnesium (Mg) is in Group 2 (alkaline earth metals). Iron (Fe) is a transition metal. Europium (Eu) is a lanthanide (rare - earth element).

Answer:

Sodium (Na)