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प्रश्न
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
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उत्तर
Atoms of the same element or different elements combine to form a molecule.
Atoms of the same element forming a molecule
1. Oxygen
2. Nitrogen
3. Hydrogen.
Atomicity is the number of atoms present in one molecule of the element.
| Element | Molecule | Atomicity |
| Hydrogen H | H2 | 2 |
| Nitrogen N | N2 | 2 |
| Oxygen O | O2 | 2 |
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
Al2(SO4)3
Give the name of the element present in the following compound:
Baking powder
Define: Atomic number
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
In what form do noble gases occur in nature?
What do the following denote ?
- N
- 2N
- N2
- 2N2
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
- What is (i) solid P (ii) gas Q, and (iii) solid R.
- What is the total mass of Q and R obtained from 50 g of P ?
- How does the total mass of Q and R formed compare with the mass of P taken ?
- What conclusion do you get from the comparison of masses of products and reactant ?
- Which law of chemical combination is illustrated by the example given in this problem ?
Work out the formula for magnesium hydrogencarbonate.
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.
Correct the following statement:
A molecule of sulphur is monoatomic.
Why are the symbols and formulae of substances important?
State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
State the atomicity of the following:
Argon
State the atomicity of the following:
Sulphur
Which of the following is a short and scientific way of representing one molecule of an element or compound?
Two elements sometimes can form more than one compound.
Define: Atomicity.
Write any two classifications of a molecule.
