Question

Mention the main features of the modern periodic table.

Answer 1

Answer:

Main features:

Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of outer electrons. Periods - In periodic table elements are arranged in a series of rows. Elements of the same period have the same number of electron shells

Answer 2

Answer:

The main features of modern periodic table

Elements are arranged in the increasing order of atomic numbers.

Elements in the modern periodic table are arranged in 7 periods and 18 groups.

Horizontal rows are called periods and vertical columns are called groups.

etc