click below
click below
Normal Size Small Size show me how
S8P1.a
Distinguish between atom & 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 simpler substances by chemical means. |
nucleus | in physical science, an atoms 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 a negative 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 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. |