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Question
The electronic configuration of an element X is 2, 8, 8, 2. To which (a) period (b) group of the modern periodic table does X belong ? State its valency. Justify your answer in each case.
The electronic configuration of an element X is 2, 8, 8, 2. To which (a) period (b) group of the modern periodic table does X belong ? State its valency. Justify your answer in each case.
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Solution
X = 2,8,8,2
Period No. = No of shells i.e. = 4
Group No. = no. of electrons in outermost shell =2 (this rule not valid in case of transition elements)
Valency = number of valence electrons (if the valence electrons are less than or equal to 4)
= 8 - number of valence electrons (if the valence electrons are more than 4)
Therefore, valency = 2
X = 2,8,8,2
Period No. = No of shells i.e. = 4
Group No. = no. of electrons in outermost shell =2 (this rule not valid in case of transition elements)
Valency = number of valence electrons (if the valence electrons are less than or equal to 4)
= 8 - number of valence electrons (if the valence electrons are more than 4)
Therefore, valency = 2
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