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State the number of sub-shells in K,L,M,N shells. 

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The number of subshells present in K, L, M, N, shells are 

Shell
Number of subshells
K
1 (1s)
L
2 (2s,2p)
M
3 (3s,3p,3d) 
N
4 (4s,4p,4d,4f)

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