Question

which is mismatched regarding the position of the element as given below?
(1) X(Z=89)-f block,6th period
(2) Y(Z=100)-f block,7th period
(3) Z(Z=115)-d block, 7th period
(4) Both (1) and (3)

Answer 1

Option (4) - Both (1) and (3) is the answer.

Upon referring the periodic table,

Element with atomic number Z = 89 is Actinium is in d block 7th period

Element with atomic number Z = 100 is Fermium is in f block 7th period

Element with atomic number Z = 115 is Moscovium is in p block 7th period

Hope it helps

Answer 2

The answer is option no.4 which is both (1) and (3).