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प्रश्न
What is the difference between the molecule of an element and the molecule of a compound? Give one example of each.
What is the difference between the molecules of elements and compounds?
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उत्तर
| Molecule of an element | Molecule of a compound | |
| 1. | It consists of two or more atoms of the same element chemically bonded together. | It consists of two or more atoms of different elements chemically bonded together. |
| 2. | Example: Bromine exists in nature as a diatomic element (Br2), wherein two bromine atoms are covalently bonded to give a molecule of bromine. | Example: A molecule of nitric acid, HNO3, comprises one atom of hydrogen, one atom of nitrogen and three atoms of oxygen chemically bonded together. |
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
CaCO3
Give the name of the element present in the following compound:
Potassium sulphate
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
An element A forms an oxide A2O5.
What is the valency of element A ?
An element X forms the following compounds with hydrogen, carbon and oxygen :
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated by these compounds.
Give one example of a polyatomic molecule.
State true of false. If false, give the correct statement.
NaCl represents one molecule of sodium chloride.
The Atomicity of phosphorous is ______
Two elements sometimes can form more than one compound.
