Question

Write a short note.
Structure of the modern periodic table.

Answer 1

Hint:Periodic Table is the table of chemical elements arranged in order of atomic number such that elements with similar atomic structures appear in the vertical columns. The modern periodic table is based on the modern periodic law and it is being made by Henry Moseley.

Complete answer:
The modern periodic law states that “Physical and Chemical properties of elements are periodic functions of their atomic number “.
In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

Group number	Group name	Property
Group 1	Alkali metals	They form strong alkalis with water
Group 2	Alkaline earth metals	They also form alkalis but weaker than group 1 elements
Group 13	Boron family	Boron is the first member of this family
Group 14	Carbon family	Carbon is the first member of this property
Group 15	Nitrogen family	This group has nonmetals and metalloids
Group 16	Oxygen family	They are also known as halogens
Group 17	Halogen family	The elements of this group form salts.
Group 18	Zero group	They are noble gases and under normal conditions they are inert.

Note:
Although it’s being used, it has some shortcomings like it doesn’t have a fixed place for Lanthanide and Actinide. It comprises elements arranged in periods and groups. Where the elements in the group have the same valence electrons and increase in number of shells by one. And in periods there is the same number of shells and the valence electrons increase by one.