How does the periodic trend of atomic radius relate to the addition of electrons?

How does the periodic trend of atomic radius relate to the addition of electrons? (Select all that apply.)

1.) increased nuclear charge across a period pulls the electrons closer, making the atoms smaller 2.) increased nuclear charge across a period increases the attraction for additional valence
3.) electrons increased nuclear charge across a period increases the energy required to lose an
4.) electron increased distance from the nucleus allows removal of an electron using less energy
5.) increased distance from the nucleus decreases attraction for additional valence electrons
6.) electrons entering an additional principal energy level increase the size of the atom


Which ones apply???