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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

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:

Al2(SO4)3


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

Quick lime


State the term.

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


Define: Atomic 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 ?


In what form do noble gases occur in nature?


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.


Work out the formula for magnesium hydrogencarbonate.


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


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.


Why are the symbols and formulae of substances important?


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:

Argon


Two elements sometimes can form more than one compound.


Define: Atomicity.


Which of the following contains maximum number of molecules?


Write any two classifications of a molecule.


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