The answer is atomic mass increases as you move down the column
Answer:
A
Explanation:
they are atoms of the same element that have the same number of protons but different number of neutrons.
Answer:
Momentum
Explanation:
The property of a moving object having mass m and moving with velocity v is called its momentum. It is given by the mathematical form as follows :

It is a vector quantity. Its SI unit of kg-m/s.
I think it is June. June is the longest day/