The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these aromic numbers.
(2) The ionisation enthalphy of the elements generally increase with increase in atomic number .
(3) For transition elemens the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals .
(4)Fifth period contain 18 elements

Options

A. 1 and 2
B. 2 and 3
C. 4 only
D. 3 only

Answer

d