An element ‘X’ (Atomic number - 20) burns in the presence of oxygen to form a basic oxide

CBSE Class 10 CBSE Class 10 Science
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1

An element ‘X’ (Atomic number - 20) burns in the presence of oxygen to form a basic oxide.

  1. Identify the element and write its electronic configuration.
  2. State its group number and period number in the modern periodic table.
  3. Write a balanced chemical equation for the reaction when this oxide is dissolved in
    water.
2
  1. Element is calcium, electronic configuration is: Ca (20): 2, 8, 8, 2
  2. Group : IInd ; Period: 4th
  3. Ca + H2O → Ca (OH)2 i.e., when calcium is dissolved in water, calcium hydroxide is formed.