Question

which elements are not main - group elements? check all that apply. al br cs mo pb

Explanation:

Main - group elements are in groups 1 - 2 and 13 - 18 of the periodic table.

• Al (aluminum) is in group 13 (main - group).
• Br (bromine) is in group 17 (main - group).
• Cs (cesium) is in group 1 (main - group).
• Mo (molybdenum) is in group 6 (transition metal, not main - group).
• Pb (lead) is in group 14 (main - group).

Answer:

Mo