Chemistry unit 2.1 0.0 / 5 ? ChemistryChemistry unit 1 ectASOCR Created by: ChloesnCreated on: 06-03-14 17:38 63247158 Across 1. Most elements exist naturally as a mixture of isotopes. The relative atomic mass is an average of the masses of the isotopes (RIM) taking into account their percentage abundances. (3) 4. Atoms of the same element with the same atomic number (number of protons), but different mass numbers (number of neutrons). (7) 5. Sub-atomic particle in the nucleus with a mass of 1 and charge of 0. (7) 8. Number of protons. (6, 6) Down 2. Sub-atomic particle around the nucleus with a very small mass c.0.00055 and charge of -1. (8) 3. Number of protons and neutrons. (4, 6) 6. Sub-atomic particle in the nucleus with a mass of 1 and charge of +1. (6) 7. Core charge is the effective nuclear charge experienced by an outer shell electron. (4, 6)
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