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Element A has mass number 40 and 21 neutrons

  1. Write the electron arrangement of element A.
  2. Give the formula of the compound formed when element A reacts with Sulphur. (S = 16.0) 

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  1. No. of electrons;   40−21=19
    Electron arrangement;  2.8.8.1 or 2 8 8 1 or  2,8,8,1, or  2:8:8:1
  2. A2S or SAor K2S or SK2
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