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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 seperated or broken down into simpler substances by chemical means. |
nucleus | is 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 number | the number of protons in the nucleus of an atom , the atomic number is the same or all atoms of an element. |
neutral | having no overall change. |
atomic mass | the mass of an atom expressed in atomic mass units. |
chemical symbol | a one or two letter code that represents an element |