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Which element has

  • (a) two shells, both of which are completely filled with electrons ?
  • (b) the electronic configuration 2, 8, 2 ?
  • (c) a total of three shells, with four electrons in its valence shell ?
  • (d) a total of two shells with three electrons in its valence shell.
  • (e)twice as many electrons in its second shell as in its first shell ?


Answer :

  • (a) Neon(2,8
  • (b) Magnesium
  • (c) Silicon(2,8,4)
  • (d) Boron(2,3)
  • (e)Carbon(2,4)

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