Extra study for NEET

PRINCIPAL OF INHERITANCE AND VARIATION TOPIC STARTED FOR EXTRA MARKS

Imporatnat for sexual reproduction in flowering plants

Orbit: orbit is a well defined circular path around the nucleus in which an electron
revolves.
Orbit of definite energy levels called shells .These shells are named as K,L,M and N and
numbered as 1,2,3, and 4 respectively from the nucleus.
An orbit (shell) can accommodate electrons equal to 2n2

For K Shell, n =1
maximum no of e-
s in K shell =2n2
=2(1)2
=2
Therefore maximum no of e-
s in K shell = 2
Similarly for L shell, n = 2, Therefore maximum no of e-
s = 8

for M shell n =3, Therefore maximum no of e-
s =18

for N shell n = 4, Therefore maximum no of e-s =32