Table of Elements

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Across
  1. 3. It was first isolated from potash, the ashes of plants, from which its name derives.
  2. 4. it is the lightest metal and the lightest solid element.
  3. 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.
  4. 8. 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.
  5. 9. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.
  6. 12. It is a steel-gray, strong, lightweight and brittle alkaline earth metal.
  7. 15. the chemical element with the symbol H and atomic number 1.
  8. 16. a chemical element with the symbol B and atomic number 5.
  9. 17. It has a great affinity towards oxygen, and forms a protective layer of oxide on the surface when exposed to air.
  10. 18. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
  11. 20. It is abundant, multivalent and nonmetallic.
Down
  1. 1. It is a soft, silvery-white, highly reactive metal.
  2. 2. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor.
  3. 5. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminum.
  4. 7. 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.
  5. 10. It is in group 18 of the periodic table and is a noble gas.
  6. 11. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas.
  7. 13. it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them.
  8. 14. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams).
  9. 19. 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.