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Periodic Classification of Elements
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Which element has
$(a)$ a total of three shells, with four electrons in its valence shell?
$(b)$ a total of two shells, with three electrons in its valence shell?
$(c)$ twice as many electrons in its second shell as in its first shell?
Option A
Option B
Option C
Option D
Solution
$(a)$ Silicon has a total of three shells, with four electrons in its valence shell $( 2$ electrons in $K$ shell, $8$ electrons in $L$ shell and $4$ electrons in $M$ shell $)$.
$(b)$ Boron has a total of two shells, with three electrons in its valence shell $( 2$ electrons in $K$ shell and $3$ electrons in $L$ shell $)$.
$(c)$ Carbon has twice as many electrons in its second shell as in its first shell $(2$ electrons in $K$ shell and $4$ electrons in $L$ shell $)$.
Standard 10
Science
