new concept of valency
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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.
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In chemistry, the valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.
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