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s8p1.a
Distinguish between atoms and molucules
Term | Definition |
---|---|
Atom | The smallest unit of an element that maintains the properties of that element. |
element | A substance that cannot be separated or broken down into simpler substances by chemical means. |
nucleus | In physical science,an atom's central region,which is made up of protons and neutrons. |
proton | A subatomic particle that has a positive charge and that is found in the nucleus of an atom. |
neutron | A subatomic particle that has no charge and that is found in the nucleus of an atom. |
electron | A subatomic particle that has a negative charge. |
atomic number | The number of protons in the nucleus of an atom;the atomic number is the same for all atoms of an element. |
neutral | Having no 0verall charge |
atomic mass | The mass of an atom expressed in atomic mass units. |
chemical symbol | A one-or two-letter code that represents an element |