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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define : Atomic Number

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प्रश्न

 Define: Atomic number

व्याख्या
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उत्तर

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

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पाठ 4: Atomic Structure - Additional questions

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एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 4 Atomic Structure
Additional questions | Q 21.2

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


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

Baking powder


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

Potassium sulphate


What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.


The cation of an element has :


Molecular compounds are usually formed by the combination between :


An element A forms an oxide A2O5.

What is the valency of element A ?


Correct the following statement:

A molecule of sulphur is monoatomic.


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


State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.


Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.


State the atomicity of the following:

Neon


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?


Classify the following molecules as the molecules of element or compound

1.  
2.  
3.  
4.  

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


Two elements sometimes can form more than one compound.


Which of the following contains maximum number of molecules?


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