The number of neutrons, protons and electrons are 16, 16 and 18 respectively, the symbol of the species is:

  1. A

    Ar 1832

  2. B

    S 2- 1632

  3. C

    S 2- 1634

  4. D

    Ar 1834

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    Solution:

    The atomic number is equal to number of protons = 16.

    The element is S.

    Atomic mass number  = 

    number of protons + number of neutrons 

    = 16 + 16 = 32. 

    The species is not neutral as the number of protons is not equal to number of electrons. It is negatively charged with charge equal to excess of electrons 

    = 18 – 16 = 2. 

     The symbol of the species is S 2- 1632

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