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  1. 2. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  2. 3. the total number of protons and neutrons in a nucleus.
  3. 6. an area ouside the atom
  4. 7. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
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  1. 1. Chemical symbols are the abbreviations used in chemistry, mainly for chemical elements; but also for functional groups, chemical compounds, and other entities.
  2. 4. The meaning of PHYSICAL PROPERTY is a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change.
  3. 5. a substance made up of only one type of atom, each with the same number of protons