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S8P1.a
distinguish between molecules and atoms
Term | Definition |
---|---|
atom | the smallest unit of an element that maintains the properties of that element |
element | a substance that cannot be broken down into simpler substances by chemical means |
nucleus | in physical science,an atomĀ“s central region, which is made up of protons and nucleus |
proton | a subatomic particle that has positive charges 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 and atom the atomic number is the same for all atoms of an element |
neutral | having no overall 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 |