SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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+1
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2
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-1
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+2
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Detailed explanation-1: -Elements with a valency of 1 can either be metals with 1 valence electron (Li, Na, K, Rb, Cs) or nonmetals with 7 valence electrons (F, Cl, Br, I).
Detailed explanation-2: –The Hydrogen atom is unique because it has only two spots in its outermost electron level. The valence number of Hydrogen is one because it has only one valence electron. It needs only one shared electron to fill its energy levels.
Detailed explanation-3: -For the most common isotope of hydrogen (symbol 1H) each atom has one proton, one electron, and no neutrons.
Detailed explanation-4: -For instance, hydrogen has 1 electron in its outermost orbit so it needs to lose 1 electron to attain stability or octet. Thus, the valency of hydrogen is 1.