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9th ICSE
IMPORTANT
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The above sketch is of the  model of an atom. (Bohr's / Rutherford's)

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Important Questions on Atomic Structure and Chemical Bonding

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9th ICSE
IMPORTANT
Give the postulates of Bohr's atomic model.
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9th ICSE
IMPORTANT
Name the three fundamental particles of an atom.
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9th ICSE
IMPORTANT
Give the symbol and charge of each fundamental particle of an atom.
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9th ICSE
IMPORTANT

Complete the table given below by identifying P, Q, R and S.

Element Symbol No. of Protons No. of Neutrons No. of Electrons
Sodium Na2311 11 P 11
Chlorine Cl3517 Q 18 17
Uranium R 92 146 92
S F199 9 10 9
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9th ICSE
IMPORTANT
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
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9th ICSE
IMPORTANT

The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?

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9th ICSE
IMPORTANT

Write down the names of the particles represented by the following symbols and explain the meaning of the superscript and subscript numbers mentioned.

P11; n01; e-10

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9th ICSE
IMPORTANT

From the symbol Mg2412 state the mass number, atomic number and electronic configuration of magnesium.