Talking about the periodic table.
Identify the group or period that matches each description.
a. Elements with 6 energy levels
b. Elements with 2 valence electrons

a. period 6

b. group 2

Explanation:

a.The atoms in the first period have electrons in 1 energy level. The atoms in the second period have electrons in 2 energy levels. The atoms in the third period have electrons in 3 energy levels. The atoms in the fourth period have electrons in 4 energy levels and same goes with 6 energy levels

b. 1 valence electron= group 1

2 v.e = group 2

3 v.e = (3+10) = group 13

i think it is true since you can test the answer and can use observations to complete it.

explanation:

0.07 g/cm³

1.37 g/cm³