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jc chemistry
the atom
Term | Definition |
---|---|
element | substance consisting of only one type of atom |
atom | smallest part of an element that can exist independently |
atomic number | number of protons in the atom of an element |
mass number | number of protons and neutrons in the atom of an element |
valency | number of electrons an element needs to lose, gain or share to achieve a full outer shell of electrons |
compound | two or more elements chemically combined |
mixture | two or more substances mingled together |