Question

as you move down the periodic table atoms get bigger. this is because ______________. 1 the atoms have more energy levels 2 the atoms have more protons. 3 the atoms have more mass. 4 the atoms have more neutrons

Explanation:

As we move down a group in the periodic table, the number of electron shells (energy levels) increases. Each new shell is farther from the nucleus, causing the atomic radius (size of the atom) to increase. Protons and neutrons contribute to mass, but the main factor for atomic size increase down a group is the addition of energy levels.

Answer:

The atoms have more energy levels.