Grade 9 - Physical Science

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Across
  1. 2. a famous particle accelerator in Switzerland?
  2. 4. the number of outer electrons in potassium?
  3. 5. a litin word means indivisible ?
  4. 6. the symbol of iron?
  5. 9. weighted average mass of all naturally occurring isotopes of an element, measured in amu?
  6. 11. soft drinks belong to which type of mixtures?
  7. 12. elements has the same number of protons but different in neutrons?
Down
  1. 1. Chlorine has two isotopes. Chlorine-35 makes up about 76% of chlorine, and chlorine-37 makes up about 24%. What is the average atomic mass of chlorine?
  2. 3. a metal used in making nuclear weapons with 92 electrons?
  3. 7. number of protons plus neutrons?
  4. 8. a model of the atom where electrons have a fixed orbits and could jump between orbits?
  5. 10. oxygen-15 has how many neutrons?