SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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+2
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-2
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-1
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+1
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Detailed explanation-1: -Statement R: The oxygen atom has six electrons, it shows a valency of 2.
Detailed explanation-2: -Oxygen has 6 valence electrons and Hydrogen has 1 valence electron.
Detailed explanation-3: -Statement A: Valency is always equal to the number of valence electrons in an atom. Statement R: The oxygen atom has six electrons, it shows a valency of 2.
Detailed explanation-4: -Selenium is a member of the sulfur family with elements including tellurium and polonium. This family has six electrons in the outermost shell.
Detailed explanation-5: -It is also equal to the number of hydrogen atoms that combine with one atom of it. In XH4 molecule, four hydrogen atoms combine with one X atom. Thus, the valency of X is 4.