The equation is Fg = G(m₁m₂/d²).
G is the universal gravitational constant, but that isn't exactly a quantity.
m₁ and m₂ are the masses of the two objects, and those are quantities.
d is the distance between the two objects, and those are quantities.
So, masses and distance.
They have a different number of neutrons. What defines what kind of element something is is how many protons it has. Hydrogen will always have 1 proton, because that's what makes it hydrogen. However, it is allowed to have different numbers of neutrons, like 0,1, or 2. They are all in the family of Hydrogen, but they are different isotopes of hydrogen. Hope this helps!
The answer IS D!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Plz feel free to adk more if u hv any confusion!!!
