1.

1. Electronic configuration of group I elements of the periodic table are given2. What is the peculiarity seen in the electronic configuration of the outer most shell of these elements?3. Which are the electrons shows the chemical properties of elements?4.  Is there any relationship between the group number and the number of electrons present in the outermost shell? What is it?

Answer»

1. 

  Element  Atomic number Electron configuration Group Period
 H 1 1 1 1
 Li 3 2,1 1 2
 Na 11 2,8,1 1 3
 K 19 2,8,8,1 1 4
 Rb 37 2,8,18,8,1 1 5
 Cs 55 2,8,18,18,8,1 1 6
 Fr 87 2,8,18,32,18,8,1 1 7

2. All these elements we can see one electron in the outermost shell. Hence elements of group I exhibit similarity in chemical properties.

3. Outermost electrons.

4. Same, group number equal tot he number of election in the outermost shell for the elements in groups 1 and 2.



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