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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Give a Reason Why – Helium is Considered Monoatomic, but Hydrogen a Diatomic Molecule.

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प्रश्न

Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.

एका वाक्यात उत्तर
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उत्तर

Helium (He) is considered monoatomic because it contains one atom while hydrogen contains two-atom (H2) therefore it considered as a diatomic molecule.

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पाठ 4: Atomic Structure - Exercise

संबंधित प्रश्‍न

Write down the name of a compound represented by the following formula:

K2SO4


Write down the name of a compound represented by the following formula:

KNO3


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.


 Define: Atomic number


Define: Mass number : 


Define: Atomic weight :


In what form does oxygen gas occur in nature ?


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.

  1. What is (i) solid P (ii) gas Q, and (iii) solid R.
  2. What is the total mass of Q and R obtained from 50 g of P ?
  3. How does the total mass of Q and R formed compare with the mass of P taken ?
  4. What conclusion do you get from the comparison of masses of products and reactant ?
  5. Which law of chemical combination is illustrated by the example given in this problem ?

Molecular compounds are usually formed by the combination between :


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.


Calculate the mass of 3.011 × 1024 atoms of carbon.


Give one example of a triatomic molecule


State the atomicity of the following:

Neon


State the atomicity of the following:

Oxygen


State the atomicity of the following:

Argon


State the atomicity of the following:

Sulphur


Classify the following molecules as the molecules of element or compound

1.  
2.  
3.  
4.  

The Atomicity of phosphorous is ______


Two elements sometimes can form more than one compound.


Define: Atomicity.


Write any two classifications of a molecule.


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