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प्रश्न

Fill in the following blanks :

Atomic Number Mass Number Protons Neutrons Electrons Symbol
10 22 _________ _________ _________ _________
रिकाम्या जागा भरा
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उत्तर

ATOMIC NO. MASS NO. PROTONS NEUTRONS ELECTRONS SYMBOL
10 22 10 12 10 Ne
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पाठ 4: Structure of the Atom - Very Short Answer Type Questions [पृष्ठ १९३]

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लखमीर सिंह Chemistry [English] Class 9
पाठ 4 Structure of the Atom
Very Short Answer Type Questions | Q 53 | पृष्ठ १९३

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संबंधित प्रश्‍न

With the help of given Table, find out the mass number of sulphur atom.

Composition of Atoms of the First Eighteen Elements with Electron Distribution in Various Shells
Name of Element Symbol Atomic Number Number of protons Number of Neutrons Number of Electrons Distribution of Electrons Valency
K L M N
Hydrogen H 1 1 - 1 1 - - - 1
Helium He 2 2 2 2 2 - - - 0
Lithium Li 3 3 4 3 2 1 - - 1
Beryllium Be 4 4 5 4 2 2 - - 2
Boron B 5 5 6 5 2 3 - - 3
Carbon C 6 6 6 6 2 4 - - 4
Nitrogen N 7 7 7 7 2 5 - - 3
Oxygen O 8 8 8 8 2 6 - - 2
Fluorine F 9 9 10 9 2 7 - - 1
Neon Ne 10 10 10 10 2 8 - - 0
Sodium Na 11 11 12 11 2 8 1 - 1
Magnesium Mg 12 12 12 12 2 8 2 - 2
Aluminium Al 13 13 14 13 2 8 3 - 3
Silicon Si 14 14 14 14 2 8 4 - 4
Phosphorus P 15 15 16 15 2 8 5 - 3.5
Sulphur S 16 16 16 16 2 8 6 - 2
Chlorine Cl 17 17 18 17 2 8 7 - 1
Argon Ar 18 18 22 18 2 8 8   0

 Give the following a suitable word/phrase.

Atoms of same element with same atomic number but a different mass number.


Multiple Choice Questions

 The sub atomic particle with negative charge is


What is variable valency? Name two elements having variable valency and state their valencies.


TRUE \ FALSE

After the emission of a beta-particle, the atomic number of the atom increases by one.


What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.


Which of the following are true for an element?

  1. Atomic number = number of protons + number of electrons
  2. Mass number = number of protons + number of neutrons
  3. Atomic mass = number of protons = number of neutrons
  4. Atomic number = number of protons = number of electrons

What is mass number of an atom?


Explain the following terms.

  1. Proton
  2. Electron
  3. Neutron.

Compare the charge and mass of protons and electrons.


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