Question

according to 2n2 rule fourth shell can accomdate 32 electrons then why 15 electrons in fourthshell of phosphorous?​

Answer 1

Explanation:

The No. of electrons or protons present in the atom is called it's atomic No..

as per the 2n2 rule.. first shell accommodate 2 electrons..

then second shell capacity is of 8 electrons... third shell capacity is of 18 and fourth shell is of 32....

but as per the rule the shell nearest to the nucleus will be filled first..

then 2nd and then 3rd

as phosphorus possess the atomic no. 15 then there are 15 electrons in the atom so they are divided as per follows: 2 in the first...

8 in the second...

and in the third shell the all remaining electrons means 5 electrons... even though the capacity is of 18 electrons but phosphorus don't have more electrons to classify... so it's Electronic configuration must be 2,8,5 there will be no electron present in the fourth shell...