Elements

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Across
  1. 4. Elements in group 18 of the periodic table, known for being inert.
  2. 6. Two or more atoms bonded together.
  3. 9. A vertical column in the periodic table.
  4. 11. A subatomic particle with a negative charge.
  5. 13. Elements in group 1 of the periodic table.
  6. 14. The tendency of an atom to attract electrons.
  7. 16. Metals in groups 3-12 of the periodic table.
  8. 18. elements, along with their concepts, to create a crossword puzzle.
  9. 21. Elements in the f-block, atomic numbers 57-71.
Down
  1. 1. Atoms of the same element with different numbers of neutrons.
  2. 2. The process of removing an electron from an atom.
  3. 3. A subatomic particle with a positive charge found in the nucleus of an atom.
  4. 5. Elements with properties intermediate between metals and nonmetals.
  5. 7. Elements in group 17 of the periodic table.
  6. 8. The central part of an atom, containing protons and neutrons.
  7. 10. A subatomic particle with no charge, found in the nucleus of an atom.
  8. 12. Elements in the f-block, atomic numbers 89-103.
  9. 15. The number of electrons in the outer shell of an atom.
  10. 17. A horizontal row in the periodic table.
  11. 19. The amount of matter in an object, often referring to atomic mass.
  12. 20. The basic unit of a chemical element.