Write the valency of Zincate?

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Solution

During the formation of the molecules or compounds, atoms combine in certain fixed proportions that different atoms have different combining capacities.
The combining capacity of an atom is its valency.
In Zincate the valency of Zinc is 2, which means it can share its 2 electrons with another atom in order to complete the outermost orbit.
Valency of Zincate (ZnO₂)^-2 is 2

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