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प्रश्न
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
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उत्तर
Molecule: Atoms of the same element or different elements combine to form a molecule. It is the smallest particle of a substance – which can normally exist independently and can retain, the physical and chemical properties of the substance.
Examples
Monoatomic molecule: Metals – Na, Mg, etc.
Diatomic molecule: H2, O2, N2.
Polyatomic molecule: O3, P4.
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संबंधित प्रश्न
Define a pure substance. How many types of pure substances do you know?
Give two examples of Metals.
Give two examples of the following.
Inert gases
Mention three gaseous elements and write their molecular formulae
Give reason: A frying pan is made up of steel but its handle is made up of wood.
Indicate whether the following statement is true or false:
Elements are made up of compounds
Tick (√) the correct alternative from the choice given for the following statement
A metal which is brittle
Classify substances into pure and impure substances in the form of a chart or tabulation.
Give an example for the elements derived from their Latin names.
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
