• Maximum number of electrons that can be accommodated in a shell is given by the formula: 2n2 , where n = 1, 2, 3…
• Maximum number of electrons in different shells are:
K shell – n=1 ; 2n2 = 2(1)2 = 2
L shell – n=2 ; 2n2 = 2(2)2 = 8
M shell – n=3 ; 2n2 = 2(3)2 = 18
N shell- n=4 ; 2n2 = 2(4)2 = 32
• The outermost orbit can be accommodated with 8 electrons at the maximum.
The electrons are not taken in unless the inner shells are filled which are filled step-wise, hence the highest element has K-2; L-8 ; M-8 distribution of electrons.
Answered by Shivani Kumari | 1 year agoWhich one of the following is a correct electronic configuration of Sodium?
(a) 2, 8
(b) 8, 2, 1
(c) 2, 1, 8
(d) 2, 8, 1
Number of valence electrons in Cl– ion are:
(a) 16
(b) 8
(c) 17
(d) 18
Isotopes of an element have
(a) The same physical properties
(b) Different chemical properties
(c) Different number of neutrons
(d) Different atomic numbers.
Rutherford’s alpha – particle scattering experiment was responsible for the discovery of
(a) Atomic nucleus
(b) Electron
(c) Proton
(d) Neutron