Answer:
The answer to your question is:
Step-by-step explanation:
1. Has 3 energy levels . If an element is in period three in the periodic table, it means that it has three energy levels.
a. F only has 2 energy levels
b. Cl Chlorine has three energy levels
c. Ar Argon has three energy levels
d. Mn it has four energy levels
2. Found in group 7A
a. F it is located in group seven
b. Cl Chlorine is located in group seven
c. Ar Argon is located in group VIII
d. Mn is located in group VB