The atomic numbers of elements A, B, C, D and E are given below : From the above table, answer the following questions - (a) Which two elements are chemically similar ?(b) Which is an inert gas ? (c) Which element belongs to 3^(rd) period of periodic table ?(d) Which element among these is a non-metal ?

The atomic numbers of elements A, B, C, D and E are given below : F

1.	The atomic numbers of elements A, B, C, D and E are given below : From the above table, answer the following questions - (a) Which two elements are chemically similar ?(b) Which is an inert gas ? (c) Which element belongs to 3^(rd) period of periodic table ?(d) Which element among these is a non-metal ?
Answer» Solution :The electronic configuration of the elements are as follows : (a) Elements C and D are chemically similar since they have same number of VALENCE electrons. (B) Element B is an inert gas element since it has complete OCTET. (c) Element C belongs to third period since it has THREE SHELLS. (d) Element A is a non-metal since it has five valence electrons.