1.

The value of four quantum number for the last electron of atom of element 'X' are n=7, l=1,m=+1 and s=+1/2 or -1/2 and vlaue of spin magnetic momentum for element 'X' is zero element 'X' has two isotopes (I) ""_(Z)^(A)X and(II) ""_(Z)^(B)X. Q. The incorrect statement regarding element 'X' is:

Answer»

Element 'X' belongs to 18th group
NUMBER of unpaired electrons in element 'X' is zero
Atomic number of element 'X' is 118
X' is representative element

Solution :X. is nobel gas not representative element ACCORDING to Bohr.s CLASSIFICATION.


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