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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 | in physical science an atom's central region ,which is made up of protons and neutrons |
Protons | 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 for all atoms of an element |
Neutral | having no overall change |
Atomic Mass | the mass of an atomic expressed in atomic mass units |
Chemical Symbol | a one or two letter code that represents an element |