4.4.4 Elements Classification

Last updated at April 25, 2026 by

What is Elements Classification?

It is the grouping of elements into metals and non-metals based on their properties .

Key Facts and Examples
  • Elements are substances that cannot be broken down into simpler substances .
Example: Iron, oxygen, carbon are elements
  • 118 elements are known at present .
Example: Hydrogen (1st), Oganesson (118th) in periodic table
  • Elements are classified as metals and non-metals .
Example: Iron, copper are metals; oxygen, carbon are non-metals
  • Non-metals are essential for life .
Example: Oxygen for breathing, carbon in all living things
Elements Classification Metals Shiny, malleable, good conductors Non-metals Dull, brittle, poor conductors Total Elements 118 known elements today

Question (Page 7): Which substances are stored in special conditions and why?

Answer:
We have studied that some non-metals are highly reactive with air and water . This is why special storage is needed.

  • Phosphorus is stored in water to prevent fire
  • Sodium metal is stored in kerosene to prevent reaction
Special Storage Requirements Stored in Water Stored in Kerosene Phosphorus - catches fire in air Sodium - reacts with water White phosphorus - very reactive Potassium - reacts vigorously

Section Summary: Substances that Behave Differently from Metals in Air and Water

Non-metals Summary Air Reactions Form acidic oxides Oxide Nature Acidic, turn litmus red Properties Dull, brittle, poor conductors Classification Elements different from metals
Remove Ads Share on WhatsApp
CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

For an uninterrupted learning experience, students can use Teachoo Black to remove ads and focus better.