Explain the connection between periods and energy levels.

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.

i believe it is a.) released into

explanation:

fe 55.85 g/mol and h2o 18.02 g/mol.