An element 'X' (Atomic number = 20) burns in the presence of oxygen to form a basic oxide. (i) Identify the element and write its electronic configuration. (ii) State its group number and period number in the Modern Periodic Table. (iii) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.

An element 'X' (Atomic number = 20) burns in the presence of oxygen to

1.	An element 'X' (Atomic number = 20) burns in the presence of oxygen to form a basic oxide. (i) Identify the element and write its electronic configuration. (ii) State its group number and period number in the Modern Periodic Table. (iii) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.
Answer» SOLUTION :(i) X(20) --- 2, 8, 8, 2. It is CALCIUM. (II) Second group, fourth PERIOD. (III) `CaO+H_(2)OtoCa(OH)_(2)`