What Are Characteristics Of The Modern Periodic Table?

It has 118 elements characterised
all the elements having same no. Of valence electrons are placed in a vertical columns called groups.
There are 18 groups. All the elements in one group have same chemical properties.
All the elements are arranged in order of their increasing atomic no. In horizontal columns called periods.
There are 7periods.

In modern periodic table vertical columns are known as groups and horizontal rows called periods that decides the characteristics of periodic table the characteristics are divided on basis of headings that
1 valance electrons
2 valancy
3 metallic character
4 metals , nonmetals, semi metals
5 nature of oxides
6 energy levels
see internet about the topics related to modern periodic table
from sri