How is motion defined in science?

Motion, in physics, change with time of the position or orientation of a body. In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity).

Explanation:

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.