Question

fill in the blanks with the number of valence electrons that each atom possesses:

• si =
• h =
• s =
• br =
• ca =
• n =

Explanation:

Step1: Locate Si in periodic table

Silicon (Si) is in group 14. Group number indicates valence - electron number for main - group elements. So Si has 4 valence electrons.

Step2: Locate H in periodic table

Hydrogen (H) is in group 1. So H has 1 valence electron.

Step3: Locate S in periodic table

Sulfur (S) is in group 16. So S has 6 valence electrons.

Step4: Locate Br in periodic table

Bromine (Br) is in group 17. So Br has 7 valence electrons.

Step5: Locate Ca in periodic table

Calcium (Ca) is in group 2. So Ca has 2 valence electrons.

Step6: Locate N in periodic table

Nitrogen (N) is in group 15. So N has 5 valence electrons.

Answer:

Si = 4
H = 1
S = 6
Br = 7
Ca = 2
N = 5