GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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17
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7
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3
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2
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Detailed explanation-1: -Therefore, the number of valence electrons = 7 .
Detailed explanation-2: -A: An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability.
Detailed explanation-3: -The family of elements having seven electrons in the valence shell is halogens, i.e., chlorine, fluorine, bromine, iodine, astatine.
Detailed explanation-4: -This demonstrates that chlorine’s outermost shell has seven valence electrons. As a result, chlorine has a valency of 7-8, which is 1.
Detailed explanation-5: -The chlorine atom has 7 electrons in the outermost shell. Losing 7 electrons to obtain the stable electronic configuration is difficult. Instead chlorine gains one electron to achieve the octet state. Therefore, its valency is 1.