The number of protons in each atom of an element. Each element has a unique [blank] number. In neutral atoms, this is also the number of electrons.
atomic [number]
An attractive force that holds two atoms together. Chemical [blank] are broken or formed during chemical reactions.
[chemical] bonds
A substance made up of two or more types of atom bonded together. Water is a [blank] with molecules made of one oxygen atom bonded to two hydrogen atoms.
compound
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