Question

17 which element is in group 3a and period 4? gallium calcium silicon neon indium

Explanation:

In the periodic table, elements are arranged in periods (rows) and groups (columns). Group 3A elements have 3 valence - electrons. Gallium is in group 3A and period 4. Calcium is in group 2 and period 4. Silicon is in group 4A and period 3. Neon is in group 8A and period 2. Indium is in group 3A and period 5.

Answer:

Gallium