Chapter 3 & 4

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Across
  1. 3. a region in an atom where there is a high probability of finding electrons; represented by lines or boxes; the number of these is equal to ½ the number of electrons in an individual sublevel
  2. 4. an outer main energy level fully occupied, in most cases, by eight electrons; in the format of [Ar]4s^23d^10, etc
  3. 5. the smallest unit of an element that maintains the chemical properties of that element
  4. 6. the quantum number that indicates the energy and orbital of an electron in an atom; the “big number”
  5. 8. one of the elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon);
  6. 11. gases are generally unreactive
  7. 16. the law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass
  8. 18. a state in which an atom has more energy than it does at its ground state; also known as the “incorrect” way
  9. 19. the sum of the numbers of protons and neutrons that make up the nucleus of an atom
  10. 20. 6.022 × 1023, the number of atoms or molecules in 1 mol
  11. 21. the lowest energy state of a quantized system; also known as the “correct” way
  12. 22. the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
Down
  1. 1. the law that 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. 2. the weighted average of the masses of all naturally occurring isotopes of an element
  3. 7. the arrangement of electrons in an atom; in the format of 1s^22s^2, etc.
  4. 9. the mass in grams of 1 mol of a substance
  5. 10. an atom that is identified by the number of protons and neutrons in its nucleus
  6. 12. the interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in a nucleus
  7. 13. the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
  8. 14. a unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12 (abbreviation, amu)
  9. 15. the SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12
  10. 17. an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)