Tosh Pratap singh

---Topic Dalton atomic Theory---
Class 9th students' pptx.

1. Colonel Academy of Radiant Education , M angla Name – Tosh pratap singh Class – 9 th “A” Subject – Chemistry Topic – Presentation on Daltons Atomic Theory Sumbitted by : Sumbitted To : Tosh P ratap Rajat Sir

2. Introduction About John Dalton John Dalton was born on September 6, 1766, in Eagles field , England, UK. NAME – John Dalton OCCUPATION - Scientist, Chemist, Meteorologist BIRTH DATE - September 6, 1766 DEATH DATE - July 26, 1844 EDUCATION - john Fletcher's Quaker grammar school PLACE OF BIRTH - Eaglesfield, United Kingdom PLACE OF DEATH - Manchester, United Kingdom

3. What is Dalton Atomic Theory ? Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of different size and mass.

4. Dalton’s Atomic Theory According to Dalton’s Atomic Theory , all matter whether an element ,a compound , or a mixture is composed of small particles called atoms. The postulates of this theory may be stated as follows: All Matter is made of very tiny particles called Atoms. ii. Atoms are indivisible particles which cannot be Created or destroyed in a chemical reaction

5. iii. Atoms of a given element are Identical in mass and Chemical properties . iv. Atoms of different elements have different masses and chemical properties . v. Atoms combine in the ratio of small whole Numbers to form compounds.

6. vi. The relative number and kinds of atoms are constant in a given compound. Symbols for some elements as proposed by daltons :

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8. Drawbacks of  Dalton's Atomic Theory  of Matter. It was proved that an  atom  is not indivisible. As an atom  can be subdivided into electrons, protons and neutrons. ... According to  Dalton Atomic Theory , atoms  of an element are identical in mass, size and many other chemical or physical properties.