Question

how many valence electrons are in gallium?
ia iia iiia iva va via viia viiia
h be b c n o f he
li be b c n o f ne
na mg al si p s cl ar
k ca sc ti v cr mn fe co ni cu zn ga ge as se br kr
options: 13, 1, 3, 4

Explanation:

Step1: Identify group of Gallium

Gallium (Ga) is in group IIIA (or 13) of the periodic table.

Step2: Relate group to valence electrons

For main - group elements (groups IA - VIIIA), the number of valence electrons is equal to the group number (for groups IA - VIIA). Since Gallium is in group IIIA, it has 3 valence electrons.

Answer:

3