what is modern concept of valency in short
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valency is calculated on the basis of valence electrons....for metals it is no of electrons and for non metals it is 8-no of valence electrons...☺
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According to this concept, the outer most shell of an atom is called valence shell and electrons of outermost shell are called valence electrons. Atoms tend to combine hi such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. In simple terms, molecules or ions ten_d to be most stable when the outermost electron shells of their constituent atoms contains eight electrons.
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According to this concept, the outer most shell of an atom is called valence shell and electrons of outermost shell are called valence electrons. Atoms tend to combine hi such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. In simple terms, molecules or ions ten_d to be most stable when the outermost electron shells of their constituent atoms contains eight electrons.
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