Question

An alkali earth metal in the third period.

Answer 1

Third-period Elements:

• The third period of the periodic table has eight elements: Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon (Si), Phosphorus (P), Sulphur (S), Chlorine (Cl), and Argon (Ar).

Alkali Earth metals-

• Group II (A) elements are called Alkali Earth metals and they are Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra)

Conclusion: Hence, an Alkali Earth metal that is also present in the third period is Magnesium (Mg).