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Each chemical element has a unique . The sum of the number of protons and neutrons in an atom is called the . The number of protons in an atom is called the atom's . An atom with more electrons than protons has a negative . Most hydrogen atoms have only a single proton in their nucleus, so a hydrogen atom that also has one neutron is an of hydrogen.

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1. Chemical properties
2. Atomic Mass
3. Atomic Number
4. Negative Charge
5.
User Jerren Saunders
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