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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Define : Atomic Number - Chemistry

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प्रश्न

 Define: Atomic number

परिभाषा
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उत्तर

Atomic number : Number of protons present in the nucleus of an atom.

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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Additional questions | Q 21.2

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:

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


Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.


Define: Mass number : 


Define: Atomic weight :


What is meant by atomicity ? Explain with two examples.


What is the atomicity of the following ?

  1. Oxygen
  2. Ozone
  3. Neon
  4. Sulphur
  5. Phosphorus
  6. Sodium

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

In what form does oxygen gas occur in nature ?


What do the following denote ?

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

Calculate the mass of 3.011 × 1024 atoms of carbon.


Give one example of a triatomic molecule


Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.


State the atomicity of the following:

Oxygen


State the atomicity of the following:

Chlorine


State the atomicity of the following:

Argon


Which of the following is a short and scientific way of representing one molecule of an element or compound?


State true of false. If false, give the correct statement.

NaCl represents one molecule of sodium chloride.


Classify the following molecules as the molecules of element or compound

1.  
2.  
3.  
4.  

Give any two examples for heterodiatomic molecules.


Write any two classifications of a molecule.


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