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Doctors Medicines MCQs Q&A

Which element has

  • Two shells, both of which are completely filled with electrons?
  • The electronic configuration 2, 8, 2?
  • A total of three shells, with four electrons in its valence shell?
  • A total of two shells, with three electrons in its valence shell? 
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1 Answers

  • Two shells, both of which are completely filled with electrons?
    Answer: Ne (Neon)
  • The electronic configuration 2, 8, 2?
    Answer: Mg (Magnesium)
  • A total of three shells, with four electrons in its valence shell?
    Answer: Si (Silicon) (14): 2, 8, 4
  • A total of two shells, with three electrons in its valence shell? 
    Answer: B (Boron) (5): 2, 3

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