Atoms and the Periodic Table

Edit Answers
123456789101112131415
Across
  1. 3. an arrangement of the elements showing the repeating pattern of their properties
  2. 4. a small particle in the nucleus of the atoms, with no electrical charge
  3. 7. the central core of an atom which contains protons and neutrons
  4. 8. - a substance made of two or more elements chemically combined in a specific ratio, or proportion
  5. 9. a horizontal row of elements in the periodic table
  6. 11. the number of protons in the nucleus of an atom
  7. 14. a small, positively charged particle that is found in the nucleus of an atom
  8. 15. the average mass of all the isotopes of an element
Down
  1. 1. the electrons that are in the highest energy level of an atom and that are involved in chemical bonding
  2. 2. elements in the same vertical column of the periodic table, also called family
  3. 5. a tiny, particle that moves around the outside of the nucleus of an atom
  4. 6. the basic particle from which all elements are made
  5. 10. an atom with the same number or protons and a different number of neutrons from other atoms of the same element
  6. 12. a one or two letter abbreviation for an element
  7. 13. the sum of protons and neutrons in the nucleus of an atom