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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:
K2SO4
Give the name of the element present in the following compound:
Baking powder
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
State the term.
The number of atoms present in a molecule of an element _________
Define: Mass number :
What is meant by atomicity ? Explain with two examples.
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 ?
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
The cation of an element has :
An element A forms an oxide A2O5.
What is the valency of element A ?
Calculate the mass of 3.011 × 1024 atoms of carbon.
Correct the following statement:
A molecule of sulphur is monoatomic.
Give one example of a polyatomic molecule.
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
Give a reason why –
Ozone is considered triatomic, but phosphorus a tetratomic molecule.
Which of the following is a short and scientific way of representing one molecule of an element or compound?
Define: Atomicity.
Which of the following contains maximum number of molecules?
