Atoms

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Across
  1. 3. it weights 1 amu.
  2. 4. determining the age of an object by comparing the ratio
  3. 5. a horizontal row in the periodic table
  4. 7. ions that are negatively charged because they have more electrons than protons
  5. 9. any two or more forms of an element where the atoms have the same number of protons
  6. 11. when 2 or more different atoms are held together by a Covelant bond
  7. 13. the average mass of an atom
  8. 16. the number of protons in an atom
  9. 17. molecules with the same number of atoms in different geometric arrangements
  10. 19. every atom is a chemical
Down
  1. 1. some atoms have too many______ in the nucleus
  2. 2. an atom with an unstable nucleus
  3. 6. a vertical column in the periodic table
  4. 7. the number, equal to the number of protons in an atom
  5. 8. when 2 or more nenmetalic atoms are bound together by sharing. Electrons
  6. 10. consist of a nucleus made of protons and neutron
  7. 12. the sum of the protons and the number of neutrons in an atom.
  8. 14. ions that are positively charge because they have more protons tgan electrons
  9. 15. 2 or more atoms that are held together by a chemical covalent bond
  10. 18. an atom or group of atoms bearing an electrical charges