Supriya Kaushik

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

1. HOLIDAY HOMEWORK OF CHEMISTRY IN DIWALI TOPIC – DALTON ATOMIC THEORY SUBMITTED BY- SUPRIYA KAUSHIK SUBMITTED TO- RAJAT MITTAL SIR

2. JOHN DALTON John Dalton was born in 1766in a poor weaver’s family in England. He received his early education from his father and at the village school. Dalton started teaching in the village at the age of 12. In 1793, Dalton left for Manchester to teach physics, chemistry and mathematics in a collage. In 1794, he described colour blindness. In 1808, Dalton presented his atomic theory to explain the properties of matter. Dalton’s atomic theory /of matter became one of the foundations of modern chemistry. Dalton was the first to calculate the masses of the atoms of several elements. He died in 1844.

3. DALTON’S ATOMIC THEORY The theory that ‘ all matter is made up of very tiny indivisible particles is called atomic theory of matter . 1. All matter is made of very tiny particles called atoms . 2. Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. 3. Atoms of a given element are identical in mass and chemical properties.

4. 4. Atoms of different elements have different masses and chemical properties. 5. Atoms combine in the ratio of small whole number to form compounds. 6. The relative number and kinds of atoms are constant in a given compound.