What are Positive and Negative Valency
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You can understand the Term Valency as the No. of Electrons required by an Entity(Ion,atom,molecule,etc.) to complete its outer most Shell/Valence Shell and to make them Stable. Or Sometimes Even The Combining Capacity of An Entity
Is an Entity has a Valency of say +2, Examples - Beryllium Group,
They Need to Donate 2 Electrons so that Their Outermost Shell gets Completed and they get Stable.
In the Case of -2 Valency, Examples - Oxygen Family,
These Elements are in Need of 2 Electrons so that The Outermost Shell get Completed and They gain Stability.
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