Is there any existence of 3f-subshell in any atom?

In which shell (s), there is no existence of d-subshell?

Which is the lowest principal energy level that permits the existence of f-subshell?

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Is there any change in hybridisation of the B and N atom as a result of the following reaction? BF_(3)+NH_(3)rarr F_(3)B.NH_(3)

Is there any change in hybridisation of the B and N atom as a result of the following reaction? BF_(3)+NH_(3)rarr F_(3)B.NH_(3)

Is there any change in hybridisation of the B and N atom as a result of the following reaction? BF_(3)+NH_(3)rarr F_(3)B.NH_(3)

For any integer a , does there exist any value of a such that a+1=a ?

Is there any change in hybridisation of B and N atoms as a result of the following reaction? BF_3 + NH_3 rarr F_3. NH_3

A : in third energy level there is no -f- subshell . R : For n=3 the possible values of l are 0,1,2 and for f- subshell l = 3. .

A : in third energy level there is no -f- subshell . R : For n=3 the possible values of l are 0,1,2 and for f- subshell l = 3. .