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Atoms

Across
Mass divided by volume
the force exerted on an object due to the acceleration of gravity. It changes with gravity.
Atoms in a gas move
Electrons are found where?
NEUTRONS have what type of charge?
Down
Protons have what type of charge?
A pure substance only made from one type of single atom
The part of an atom that has the least mass
The basic unit of a chemical element
The amount of space an object take up
The amount of matter in an object