Atoms and Elements

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Across
  1. 2. an element with the chemical symbol K
  2. 6. particle with an electrical charge of 1-
  3. 10. the area around the nucleus of an atom where its electrons are most likely found
  4. 11. horizontal row of elements on the periodic table
  5. 12. an element where its name origin comes from the Latin word calcis
  6. 13. a metal element with an atomic weight of 65.38
  7. 14. smaller particles that make up neutrons and protons
  8. 16. atom of the same element that has a different number of neutrons
  9. 17. a noble gas elemeny commonly used in balloons
  10. 18. particle with an electrical charge of 1+
  11. 19. an artifically made metal element with the chemical symbol Pm
  12. 20. particle that does not have an electrical charge
Down
  1. 1. a small, positively charged center of the atom where protons and neutrons are found
  2. 3. the weighted mass of the element's mixture of its isotopes
  3. 4. elemental group in which its name literally means "salt-former"
  4. 5. the smallest piece of matter that still retains the property of an element
  5. 7. the elements arranged by the increasing atomic number and changes in physical and chemical properties
  6. 8. a Russian chemist who searched for a way to organize the elements, creating the periodic table
  7. 9. uses the symbol of the element and dots to represent the electrons in the outer energy level
  8. 15. the number of protons in an atom