What are f-block elements? Where are they placed in the periodic table?

The lanthanides are placed in the periodic table at

Which is the first element in the periodic table ?

Chlorine has two isotopes, viz. Cl-35 and Cl-37 Their atomic masses are 35 and 37. Their chemical properties are same. Where should these be placed in Mendeleev's periodic table? In different places or in the same place?

Name the element having the simplest atomic structure in the periodic table.

Select the appropriate options and complete the following paragraph. (metals, nonmetals, metalloids, four, seven, s-block, p-block, d-block, f-block) On the basis of electronic configuration, elements in the modern periodic table are classified into ________ block. Groups 1 and 2 elements are included in _______ and all these elements are metals (except hydrogen). Group 13 to 18 elements are included in ________. This block contains metals, nonmetals and metalloids. Groups 3 to 12 elements are included in _______ and all these elements are _______. elements shown at the bottom of the periodic table i.e., Ianthanides and actinides constitute ______ and all these elements are metals.

The group 18 element placed in period 3

State whether the following statements are True or False: In the modern periodic table, properties of the elements are a periodic function of their atomic numbers.

How are isotopes of different elements placed in the Modern peridic Table?

d-block metals belong to __________periods of the periodic table.

What is the position of Actinoids in the periodic table?