Chemistry-
General
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Question

An element of atomic weight 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statements regarding this element is not correct

  1. (a) It belongs to II group of the periodic table  
  2. It has 20 neutrons   
  3. (c) The formula of its oxide is M O subscript 2 end subscript  
  4. It belongs to 4th period of the periodic table  

The correct answer is: (c) The formula of its oxide is M O subscript 2 end subscript


    Its valency is 2. So it will form MO type compoun

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