How can two objects with different masses have the same amount of gravitational potential energy?

In reality, if we are talking about an object under the influence of the Earth's gravity, the gravitational potential energy of the object will change minutely, even if kept at the same elevation above sea level, because of differences, if it is moved to different positions, due to changes in sub-surface rock masses

Explanation:

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.