periodic table crossword

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Across
  1. 4. A term describing a phenomenon whereby certain isotopes known as radioisotopes are subject to a form of decay brought about by the emission of high-energy particles.
  2. 5. An atom or atoms that has lost or gained one or more electrons, thus acquiring a net electric charge.
  3. 9. A one-or two-letter abbreviation for the name of an element.
  4. 12. A figure used by chemists to specify the mass—in atomic mass units—of the average atom in a large sample.
  5. 13. A group of atoms, usually but not always representing more than one element, joined by chemical bonds. Compounds are typically made of up molecules.
  6. 15. when a isotope goes down to a different isotopes
  7. 16. Electrons that occupy the highest energy levels in anatom. These are the electrons involved in chemical bonding.
  8. 17. Atoms that have an equal number of protons, and hence are of the same element, but differ in their number of neutrons. This results in a difference ofmass. Isotopes may be either stable or unstable. The latter type, known as radioisotopes, are radioactive.
  9. 18. a positivly charged atom
  10. 19. the row on the periodic table that goes down
Down
  1. 1. Electrons that occupy the highest energy levels in anatom. These are the electrons involved in chemical bonding.
  2. 2. The number of protons in the nucleus of an atom. Since this number is different for each element, elements are listed on the periodic table of elements in order of atomic number.
  3. 3. An SI unit (abbreviated amu), equal to 1.66 · 10 −24 g, for measuring the mass of atoms.
  4. 6. A pattern of probabilities regarding the regions that an electron can occupy within an atom in a particular energy state. The higher the principal energy level, the more complex the pattern of orbitals.
  5. 7. A subatomic particle that has no electric charge. Neutrons, together with protons, account for the majority of average atomic mass.
  6. 8. A substance made up of only one kind of atom, which cannot be chemically broken into other substances.
  7. 10. The SI fundamental unit for "amount of substance." A mole is, generally speaking, Avogadro's number of atoms, molecules, or other elementary particles; however, in the more precise SI definition, a mole is equal to the number of carbon atoms in 12.01 g of carbon
  8. 11. the row on the periodic table that goes to the side
  9. 14. A substance made of two or more elements that have bonded chemically. These atoms are usually, but not always, joined in molecules.
  10. 16. A figure used by chemists to specify the mass—in atomic mass units—of the average atom in a large sample.