MAHARASHTRA Class 10 Chemistry Periodic Classification of Elements
Classification - Early Attempts
Classification - Early attemptsModern Periodic Table of Elements
Elements in Modern Periodic Table are arranged in order of increasing atomic number
There are 18 vertical columns called groups and 7 horizontal rows called periods.
Atomic size decreases across a period and increases along a group.
Metallic character increases down the group and decreases along a period and vice versa for non-metallic character.
