Question

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1. If the formula of an element is E,, its atomicity is
2. The smallest particle of an element is
3. The combining capacity of an element is called its
4. The correct formula of calcium hydroxide is
5. A substance that is formed when two or more elements combine chemically is cal​

Answer 1

Lakhmir Singh Solutions Class 9 Chemistry Chapter 3 Atoms and Molecules

The word ‘atom’ means indivisible- something which cannot be divided further. Kanad was one of the first person to propose that matter is made up of particles called ‘parmanu’. John Dalton called these particles as atoms.

All matter is made up of small particles called atoms and molecules. Different atoms and molecules have different properties, thus the properties of matter depend on properties of atoms and molecules which it is made. Atoms combine to form molecules. They are an electrically neutral group of two or more atoms chemically bond together.

A molecule is the smallest particle of a substance that has the properties of that substance. There were established many experiments that confirm the idea of atom being the smallest particle of matter. Law of chemical combination is one of the concepts came forward that comprises of three laws. Later Dalton’s atomic theory was established saying that all matter is made up of very very tiny indivisible particles called atoms. There were many assumptions and drawbacks of this theory.

Answer 2

Answer:

Yeah it is correct good