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S8P1.a
distinguish between atoms and molecules
Term | Definition |
---|---|
atoms | 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 substance by chemical means |
nucleus | in physical science, an atom's central region which is made up of protons and neutrons |
protons | a subatomic particle that has a positive charge and that is found the nucleus of an atom |
neutron | a subatomic particle that has no change 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 overall change |
atomic mass | the mass of an atom expressed in atomic units |
chemical symbol | a one or two letter code that represents an element |