If an atom has only one shell which contains 2 electrons, it is said to be a/an
A
Octet.
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B
duplet.
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C
isotope.
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D
compound.
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Solution
The correct option is B
duplet.
According to Bohr's atomic theory, the electrons in an atom are placed in different energy shells and the maximum number of electrons which a shell can occupy is given by the formula 2n2 where n is the shell number.
If the outermost shell of an atom is completely filled with electrons in it, then the atom is said to have a stable configuration.
The innermost shell or the first shell (K shell) can occupy a maximum of 2 electrons. ( 2n2 = 2 x (1)2 = 2 ). Hence it is said to be a duplet.
The next shell (L shell) can occupy a maximum of 8 electrons. ( 2n2 = 2 x (2)2 = 8 ). Hence it is said to be an octet.
