Question

what is the meaning of valency for grade 3(actually my sister is asking)​

Answer 1

a measurement of the power of an atom to combine with others, by the number of hydrogen atoms it can combine with or take the place of

एक अणु की अन्‍य अणुओं से संयोजित होने की क्षमता; संयोजन क्षमता, संयोजकता

in simple words

combing capacity

Answer 2

The weight or the no of protons or electrons in an atom