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How can valency known? |
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Answer» If the outermost shell of an atom has a total of 8 electrons then the atom is said to have attained a complete octet. An atom has to gain, lose or share a particular number of electrons from its outermost orbit to obtain complete octet. Therefore, a capacity of an atom is the total number of electrons gained, lost, or shared to complete its octet arrangement in the outermost atom. This capacity of an atom will also determine the valency of an atom. 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. Similarly, magnesium has 2 electrons in its outermost orbit and it needs to lose them to attain octet and obtain stability. Therefore, the valency of magnesium is 2. Valency can be known throuugh their outermost cell . |
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