How do you know which charge to use for elements with variable charges when balancing the equation? For example, when copper metal is mixed with silver nitrate, the product is copper nitrate(Cu(NO3)2) and silver. How is it known to use copper(II) and not copper(I)?
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Answer:
we have to learn Valencies of common elements
Explanation:
According to their electronic configuration
eg Na +1 Cu+2
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