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- 2. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 5. A horizontal row of the periodic table.
- 7. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 9. It is 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.
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- 1. The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
- 3. A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 4. Table A tabular array of the chemical elements organized by atomic number
- 6. A particle of matter that uniquely defines a chemical element
- 8. A column in the periodic table of the chemical elements.