The Periodic Table

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Across
  1. 5. An atom of the same element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.
  2. 8. The process by which an atom or molecule gains or loses electrons to form an ion.
  3. 10. A measure of an atom's ability to attract electrons in a chemical bond.
Down
  1. 1. A positively charged ion, formed when an atom loses one or more electrons.
  2. 2. A horizontal row in the periodic table, representing elements with the same number of electron shells.
  3. 3. A vertical column in the periodic table, representing elements with the same number of valence electrons.
  4. 4. The tendency of a substance to undergo chemical reaction.
  5. 6. A negatively charged ion, formed when an atom gains one or more electrons.
  6. 7. Atomic ___ : number of protons
  7. 9. Atomic ___ (measured in amu)