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chemistry
terms in chapter 2
Term | Definition |
---|---|
valence shell | the outermost shell of an atom |
molecule | what is formed when 2 or more atoms bond together |
compound | what is formed when atoms of 2 or more elements bond together |
atomic number | number of protons in an atom |
mass number | sum of protons and neutrons in the nucleus of an atom |
neutron | subatomic particle with out a charge |
proton | subatomic particle with a positive charge |
electron | subatomic particle with a negative charge |