The atomic number of an element X is 12

CBSE Class 10 CBSE Class 10 Science
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1

The atomic number of an element X is 12.

  1. Write its electronic configuration and determine its valency.
  2. Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer give reason.
  3. Is it a metal or a non-metal.
  4. Write the formula of its oxide.
2
  1. Electronic configuration : 2, 8, 2; valency: 2
  2. The element X is less reactive than Ca (atomic number 20)
    Reason: Size of X is smaller and has high force of attraction between valence electrons and nucleus.
  3. Element X is a metal.
  4. The formula of its oxide is XO.