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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 element |
Element | A subtance that cannot be separated or broken down into simpler subtance by chemical means |
Nucleus | in physical science, an atom's central region, which is made up of protons and neutrons |
Electron | A subtance partical 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 |
chemical symbol | a one-or two-letter code that reperesents an element |