The correct statement for the periodic table of elements is….
a. All the elements in the d block are solid at room temperature and pressure.
b. The s-block elements tend to form positively charged ions.
c. The elements in the lanthanide series are in 7^{th} period.
d. The elements in group 18 are unable form compounds with other elements.
e. The d-block transition elements start to fill in the 3^{rd} period.