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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 separated or broken down into simpler substances by chemical means |
Nucleus | an atoms main region |
Proton | subatomic paticle that is positive charge found in the nucleus of an atom |
neutron | subatomic particle with no charge in the nucleus of an atom |
Electron | subatomic particle that has a negative charge found in the nucleus of an atom |
Atomic Number | number of protons in the nucleus of an atom |
neutral | having no overall charge |
atomic mass | the mass of an atom expressed in atomic units |
a one- or two-letter code that represents an element |