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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:

Al2(SO4)3


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:

CaCl2


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:

Quick lime


Give the name of the element present in the following compound: 

Baking powder


State the term.

The number of atoms present in a molecule of an element _________


Define: Atomic number


Write the formulae of the following compounds. Also name the elements present in them.

  1. Water
  2. Ammonia
  3. Methane
  4. Sulphur dioxide
  5. Ethanol

What do the following denote ?

  1. N
  2. 2N
  3. N2
  4. 2N2

What is the difference between the molecule of an element and the molecule of a compound ? Give one
example of each.


Calculate the mass of 3.011 × 1024 atoms of carbon.


Correct the following statement:

A molecule of sulphur is monoatomic.


Why are the symbols and formulae of substances important?


Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.


Give one example of a triatomic molecule


Give a reason why –

Ozone is considered triatomic, but phosphorus a tetratomic molecule.


State the atomicity of the following:

Neon


State the atomicity of the following:

Oxygen


State the atomicity of the following:

Chlorine


State the atomicity of the following:

Sulphur


If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.


The Atomicity of phosphorous is ______


Two elements sometimes can form more than one compound.


Derive the relationship between Relative molecular mass and Vapour density.


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