The Periodic Table

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Across
  1. 1. Electrons in this shell are called
  2. 4. Are elements that appear dull and are poor conductors of heat.
  3. 5. Formed between non-metals and metals through an electron transfer.
  4. 8. Element with the lowest electronegativity.
  5. 9. The outermost layer of an atom.
  6. 10. chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
  7. 15. as "like a metal", which means that they conduct heat and electricity moderately well, and possess some properties of metals and some properties of non-metals.
  8. 17. the vertical columns on the table. These define a "family" of elements which have similar chemical properties
  9. 19. German chemist who observed that several elements could be classified into sets of three which is called Triad
  10. 20. A group of elements that has full octet electrons.
  11. 21. In the same group with the same electron configuration in their valence electron.
Down
  1. 2. positively charged ion is called
  2. 3. He reported the discovery of a new gaseous element ARGON This element is chemically inert and did not fit any of the known periodic groups.
  3. 6. Non-metals form blank by sharing an electron-pair between them.
  4. 7. negatively charged ion is called
  5. 11. Eight valence electrons is described by the
  6. 12. The horizontal rows on the table, with the elements arranged in order of increasing atomic number.
  7. 13. Are elements that are shiny, ductile, and good conductors of heat and electricity.
  8. 14. type of covalent bond in which the electrons forming the bond are unequally distributed
  9. 16. An atom or a molecule that has an electrical charge is called
  10. 18. English chemist who presented another way of classifying and organizing the elements.