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प्रश्न
Which of the following is the valence shell for the elements of second period of the modern periodic table?
(a) M shell
(b) K shell
(c) L shell
(d) N shell
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उत्तर
(c) L shell.
L is the valence shell for elements of the second period of the modern periodic table, since the period number is decided by the number of valence shells.
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