Question

1. how many energy levels do each of the group 1 element have on their bohr model?

a. hydrogen (h) has ____ number of energy levels.
b. lithium (li) has ____ number of energy level.
c. sodium (na) has ____ number of energy levels.

Explanation:

Step1: Recall Bohr - model principle

The period number in the periodic table is equal to the number of energy levels in the Bohr - model of an atom.

Step2: Identify period of Hydrogen

Hydrogen is in period 1, so it has 1 energy level.

Step3: Identify period of Lithium

Lithium is in period 2, so it has 2 energy levels.

Step4: Identify period of Sodium

Sodium is in period 3, so it has 3 energy levels.

Answer:

a. 1
b. 2
c. 3