Chem Concepts Chapter 3 Vocabulary

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Across
  1. 2. _____ number the number of protons in the nucleus of an atom
  2. 8. _____ spectrum all of the frequencies or wavelengths of electromagnetic radiation
  3. 10. the SI base unit used to measure the amount of asubstance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12
  4. 12. _____ state is when an atom has more energy than in its ground state
  5. 14. the mass in grams of 1 mol of a substance
  6. 15. The law of _____ states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass
  7. 16. a subatomic particle that has a negative charge
  8. 17. a subatomic particle that has a positive charge and that is found in the nucleus of an atom
Down
  1. 1. The law of _____ states that when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in the ratio of small whole numbers
  2. 3. _____ number the sum of the numbers of protons and neutrons in the nucleus of an atom
  3. 4. an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
  4. 5. an atom's central region, which is made up of protons and neutrons
  5. 6. _____ state is the lowest energy state of a quantized system
  6. 7. a region in an atom where there is a high probability of finding electrons
  7. 9. a subatomic particle that has no charge and that is found in the nucleus of an atom
  8. 11. The law of conservation of _____ states that mass cannot be created or destroyed in ordinary chemical and physical changes
  9. 12. the arrangement of electrons in an atom
  10. 13. _____ numbers a number that specifies the properties of electrons