Answer:
It changes size and shape
Explanation:
Proving Air Is Matter
One way to prove that air is made of matter is to blow up a balloon. Before you add air into the balloon, it is empty and shapeless. When you puff air into it, the balloon expands, so you know it is filled with something—air is taking up the space.
Sodium has 1 valence electron and bismuth has 83 electrons (5 valence electrons)
1/....
If we say acceleration 'a' is inversely proportional to mass 'm', then
a=1/m.
