Question

why is the electronic configuration of K and Ca is in different way?

Answer 1

Did you mean to ask, "how does the electronic configuration of K differ from Ca?" K has one valence shell electron and Ca has two.

Answer 2

no as the no of electron in K L M N are 2,8,18,32 why K and Cl have such configuration?

Answer 3

K and Ca, or K and Cl? Ca and Cl are very different. Cl has one less electron than Ar, so it accepts and electron to have a full valence shell. K has one more electron than Ar, so it donates and electron instead.

Answer 4

http://www.webqc.org/periodictable.php
electronic(valance) configuration can be explained better with spdf arrangement rather than klmn
K@pottassium has potassium has 1 electron in the outer most S shell while Ca @ calcium has 2 in outer S shell........ loosing 1 electron of outer shell makes K, K+, then further removing of electrons need to be removed from the penultimate completed P shell, which needs a lot of energy if possible. http://en.wikipedia.org/wiki/Potassium

In the case of calcium 2 electrons can be removed to produce Ca2+ ...... http://en.wikipedia.org/wiki/Calcium_ions