Structure of the Atom Notes PDF for Class 9

STRUCTURE OF THE ATOM  WHAT IS AN ATOM? Atoms are made up of three subatomic particles such as electrons, protons and neutrons. Protons have a positive electrical charge, electrons have…

What is Valency? How to find valency of first 20 elenents

Let’s  start the introduction of  what is Valency of elements  What is Valency? The capacity of an atom of an element to form chemical bonds is known as its valency.…

Thomson’s Model of an Atom (Plum Pudding Model)

THOMSON’S MODEL OF THE ATOM Thomson’s model of an atom is also called the plum pudding model. The plum pudding model is one of the several historical scientific models of…

Discovery of the neutron, proton and electron

Discovery of the neutron, proton and electron Explain Discovery of the Neutron Who discovered neutron?  The existence of neutron in the atoms was discovered by James Chadwick in 1932. The…

Why thermocol is used as a base for many electric circuit experiments?

Why Thermocol is used as a base for many electric circuit experiments? Thermocol is used as a base for many electric circuit experiments because thermocol is lightweight with high insulation…

Bohr Model of the Atom – Overview & Examples

Let’s start the introduction of the Bohr Model of the Atom. Bohr  Model of the Atom A Danish physicist named Neil Bohr in 1913 proposed the Bohr’s atom of the…

Rutherford Model of the Atom – Explanation and Limitation

 Let’s start the introduction of the Rutherford Model of the Atom Rutherford’s model of the atom The Rutherford model of the atom is also called a nuclear atom or planetary…

The pH Scale | Amazing pH Value Chart (0-14)

 Explanation of the pH Scale The pH Scale: pH scale is a scale for measuring hydrogen ion (H+) concentration. The concentration of H+ ion is generally small, therefore the concentration…

Acids and Bases – 9 Properties, Useful Reaction & Examples

  Acids and Bases Acids Those substances which turn blue litmus solution red are called acids. The term ‘acid’ has been derived from the Latin word ‘acidus’ which means sour.…

Indicators | Litmus, Methyl orange, Phenolphthalein

Definition of Indicators An indicator tells us whether the substance we are testing is acidic or basic by a change in its colour. In other words, Those substances which change…

error: Content is protected !!