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प्रश्न
State how electrons are distributed in an atom. Explain in brief the rules which govern their distribution.
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उत्तर
(a) Electrons revolve around the nucleus in imaginary paths called shells or orbits. Shells start from the nucleus to outwards.
Rules: The maximum number of electrons in a shell is given by 2n2. Where n is the number of shell i.e. 1st shell can have a maximum of 2 electrons.
2n2 = 2(1)2 = 2 × 1 = 2
2nd shell can have maximum of 8 electrons
2n2 = 2(2)2 = 2 × 4 = 8
3rd shell can have maximum of 18 electrons
2n2 = 2 (3)2 = 2 × 9 = 18 and so on….
(b) Outer most orbit cannot have more than 8 electrons and 18 in penultimate orbit.
(c) A new shell cannot start until previous is filled completely.
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संबंधित प्रश्न
Fill in the blank
The outermost shell of an atom is known as............................
Write true or false for the following statement
The maximum number of electrons in the first shell can be 8.
Write true or false for the following statement
The central pad of the atom is called nucleus.
Give the following a suitable word/phrase.
The smallest unit of an element which takes part in a chemical reaction.
Name three fundamental particles of the atom. Give the symbol with charge, on each particle.
FILL IN THE BLANK
In an atom, the last shell containing electrons is called its..................shell.
TRUE \ FALSE
Electrons are present in the nucleus.
WRITE SHORT ANSWER
What do you mean by electron transition?
ANSWER IN DETAIL
What is the maximum number of electrons that L shell can accommodate ? Give reasons for your answer.
State its one drawback of Rutherford’s atomic model.
