Table of Elements

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Across
  1. 3. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminum.
  2. 5. a chemical element with the symbol B and atomic number 5.
  3. 8. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure.
  4. 9. It is in group 18 of the periodic table and is a noble gas.
  5. 11. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
  6. 12. it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them.
  7. 13. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
  8. 14. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.
  9. 16. it is the lightest metal and the lightest solid element.
  10. 18. It is a steel-gray, strong, lightweight and brittle alkaline earth metal.
  11. 19. It is a soft, silvery-white, highly reactive metal.
Down
  1. 1. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams).
  2. 2. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas.
  3. 4. It has a great affinity towards oxygen, and forms a protective layer of oxide on the surface when exposed to air.
  4. 6. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor.
  5. 7. the chemical element with the symbol H and atomic number 1.
  6. 10. It was first isolated from potash, the ashes of plants, from which its name derives.
  7. 11. It is a noble gas.[10] Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.
  8. 15. It is abundant, multivalent and nonmetallic.
  9. 17. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.