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S8P1.a
Distinguish between atoms and molecules
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 simper 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 mass | the mass of an atom expressed in atomic ass units |
atomic number | the number of protons in the nucleus of the atom:the atomic number is the same for all atoms of an element |
chemical symbols | a one-or two-code that represents |
neutral | no overall charge |