Question

What is atom???????
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Answer 1

• Dalton’s Atomic Theory

1. Every matter is made up of very small or tiny particles called atoms.

2. Atoms are not divisible and cannot be created or destroyed in a chemical reaction.

3. All atoms of a given element it are same in size, “mass and chemical properties.

4. Atoms of different elements are different in size, mass 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. 9

• Atom

Atoms are the smallest particles of an element which can take reaction.

Size of an atom: Atomic radius is measured in nanometres.

Atomic radii of hydrogen atom = 1 × 10–10 m.

Answer 2

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