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Chemistry

Structure of the Atom

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 a negative electrical charge and neutrons have no electrical charge at all. Protons and neutrons are present in a small nucleus at the centre of …

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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. It decided by the number of valence electrons in its atom.  How to find Valency ( How to calculate valency) The valency of a metal …

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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 the atom. First proposed by J.J. Thomson in 1903 soon after the discovery of the electron but before the discovery of the atomic nucleus.   …

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Discovery of the neutron

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 neutron is a neutral particle present in the nucleus of an atom. Atoms of all the elements contain neutrons except hydrogen atom which does not …

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Why Thermocol is used as a base for many electric circuit?

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 value. Thermocol or EPS sheets are excellent thermal insulators. Electric current cannot pass through the Thermocol sheet because Thermocol is an insulator. Thermocol is also …

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Bohr Model of the Atom

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 model. Bohr’s atomic model is also known as Bohr Atomic Model or Bohr model. He modified the problems and drawbacks associated with Rutherford’s model of …

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Rutherford Model of the Atom

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 model of the atom, a description of the structure of atoms proposed by Ernest Rutherford. An atom consists of a positively charged, dense, and very …

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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.   Example: HCl, H2SO4 , HNO 3 etc   Properties of acids Acids have a sour taste Acids turn blue litmus to red. It conducts …

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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 their colour in different types of substances are known as indicators. There are many natural substances like red onion peels, red cabbage leaves, beetroot extract, …

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