Question

what do aluminum (al), sodium (na), and chlorine (cl) have in common? they are all metals. they are all nonmetals. they are all in the same group. they are all in the same period.

Explanation:

• Aluminum (Al) is a metal, sodium (Na) is a metal, and chlorine (Cl) is a non - metal. So, the first two options (all metals or all non - metals) are incorrect.
• Looking at the periodic table:
• Sodium (Na) is in group 1, aluminum (Al) is in group 13, and chlorine (Cl) is in group 17. So, they are not in the same group.
• Sodium (Na), aluminum (Al), and chlorine (Cl) all have 3 electron shells. In the periodic table, the number of electron shells is equal to the period number. So, they are in period 3.

Answer:

They are all in the same period.