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different elements must have different numbers of what a. all particles b. protons c. electrons d. neutrons

User Kenmistry
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2 Answers

6 votes

The answer would be d: Neutrons :)

User David Hyde
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D: Three hydrogen atoms have the same number of protons, but different amount of neutrons. These atoms are called isotopes, which are atoms of the same element but different amount of neutrons
User Felker
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