Question

The total number of inner transition elements present in the period are...

Answer 1

Hint: Periodic table consists of elements which are arranged on the basis of increase of atomic number. There are four blocks of the periodic table, that is, s-block, p-block, d-block and f-block.

Complete step by step solution:
We know that the inner transition elements are the elements present in the f-block of the periodic table.
In the seventh Period there exist a total of 14 elements which are Th, Pa, U, No, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr.

Additional information:
Periodic tables classify the elements on the basis of the modern periodic law i.e. the elements are arranged in the increasing order of their atomic numbers. The elements are grouped into s-block, p-block, d-block and f-block.
In the f-block are the inner transition metals are placed at the bottom of the Periodic Table. These metals are as reactive as the alkali metals, and all the actinides are toxic elements, and they possess no commercial value. The Lanthanides and the actinides are f-block elements. All these elements are metals. All the elements in the actinide series are radioactive elements. Elements after U(92) are all synthetic. The inner transition elements are coloured ions. The inner transition elements show variability in their valency. Actinides are radioactive in nature.

Note: Students might confuse whether f-block elements are transition elements or not. The f-block elements are termed as inner transition metals and the last three shells of them are incomplete.