Jab koi element electrons ko lose ya gain karta hai tab jinte electrons ko weh gain karta hai ya lose karta Use valency kehte hai Ex- lithium Electronic configuration 2,1 to ye 1 eloctron lose Kare ga to iss ki valency hogi 1Jisse hum valency kahe ge Or Ex- oxygen Electronic configuration 2,6 to ye 2 electrons gain kare GA Apne app ko Nobel gas Mai convert Karne ke liye iss liye iss ki valency hai 2 ?

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