Which sentence describes energy? O A. It measures changes in the temperature of an object.
B. It measures the speed at which an object is moving.
O C. It measures the capacity to do work.
D. It measures the amount of mass an object has.

C

Explanation:

energy is measures the capacity to do work.

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.