Hurry
(physical science)
use newtons law to explain why, when a 100kg astronaut throws a 9kg bowling ball forward in space, she moves backward but slower

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answer to your question is c