– a unit of matter; the smallest unit of a chemical element.

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Presentation transcript:

– a unit of matter; the smallest unit of a chemical element

– a positively charged particle within the atomic nucleus

– a particle without an electrical charge within the atomic nucleus

– a negatively charged particle; can be either free (not attached to any atom) or bound to the nucleus of an atom

– a particle smaller than an atom, such as a proton, neutron, or electron

- A possible level of energy that an electron can have in an atom.

- The outermost electrons in an atom.

- A group of elements sharing similar properties.

- A row (left to right) of the periodic table.

A tabular arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column.