Class 9 Exam > Class 9 Questions > If K and L shells of an atom are full, then w...
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If K and L shells of an atom are full, then what would be the number of electrons in the atom?
- a)8
- b)10
- c)18
- d)2Atomic nucleus
Correct answer is option 'B'. Can you explain this answer?
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If K and L shells of an atom are full, then what would be the number o...
To determine the number of electrons in an atom, we need to know the electronic configuration of the atom. The electronic configuration is a representation of the arrangement of electrons in different energy levels or shells.
In this case, we are given that both the K and L shells of the atom are full.
The K shell can hold a maximum of 2 electrons, and the L shell can hold a maximum of 8 electrons.
Since both shells are full, we can determine the number of electrons in the atom by adding the maximum number of electrons in each shell:
- K shell: 2 electrons
- L shell: 8 electrons
Therefore, the total number of electrons in the atom is 2 + 8 = 10.
Hence, the correct answer is option B: 10.
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