Chemistry unit 2.1 0.0 / 5 ? ChemistryChemistry unit 1 ectASOCR Created by: ChloesnCreated on: 06-03-14 17:38 86532147 Across 1. Sub-atomic particle in the nucleus with a mass of 1 and charge of +1. (6) 4. Sub-atomic particle in the nucleus with a mass of 1 and charge of 0. (7) 5. Atoms of the same element with the same atomic number (number of protons), but different mass numbers (number of neutrons). (7) 7. 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) 8. Number of protons. (6, 6) Down 2. Core charge is the effective nuclear charge experienced by an outer shell electron. (4, 6) 3. Sub-atomic particle around the nucleus with a very small mass c.0.00055 and charge of -1. (8) 6. Number of protons and neutrons. (4, 6)
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