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 value of spin magnetic momentum for element 'X' is zero. Element 'X' has two isotopes (I) ZAX and, (II) ZBX .
(Given: " B−A=B−2Z=18 ", where A and B are atomic masses and Z is atomic number.)
The incorrect statement regarding element 'X' is :
a. Element 'X' belongs to 18th group.
b. Number of unpaired electrons in element 'X' is zero
c. Atomic number of element 'X' is 118
d. 'X' is representative element