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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 the 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 ans neutrons. |
Protons | A subatomic particle that has a positive charge and that is found in the nucleus of an atom. |
Neutrons | 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. |
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. |