Question

which element in period 3, group 1 is known to be a highly reactive metal? sodium (na) sulfur (s) scandium (sc) argon (ar)

Explanation:

Sodium (Na) is in Period 3, Group 1 of the periodic table. Group 1 elements are alkali metals and are highly reactive. Sulfur (S) is a non - metal in Group 16. Scandium (Sc) is in Group 3. Argon (Ar) is a noble gas in Group 18 and is inert.

Answer:

sodium (Na)