Six elements of periodic table A, B, C, D, E and F have atomic numbers of 2, 12, 20, 18, 4 and 10 respectively (where A, B, C, D, E and F are not the chemical symbols of these elements). Based on this information, answer the following questions : Which of these elements are chemically (i) reactive and (ii) unreactive ?

Six elements of periodic table A, B, C, D, E and F have atomic numbers

1.	Six elements of periodic table A, B, C, D, E and F have atomic numbers of 2, 12, 20, 18, 4 and 10 respectively (where A, B, C, D, E and F are not the chemical symbols of these elements). Based on this information, answer the following questions : Which of these elements are chemically (i) reactive and (ii) unreactive ?
Answer» SOLUTION :First of all, write the electronic configurations of all the given SIX elements as follows: (4) (i) (i) Elements B, C and E of group 2 are chemically reactive elements. (II) Elements A, D and F of group 18 are chemically UNREACTIVE elements.