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Which condition must be met in order for an equation to be balanced?

The elements in the reactants are the same as the elements in the products.
There are fewer elements in the reactants than there are in the products.
The number of atoms in the reactants is greater than the number of atoms in the products.
The number of atoms in the reactants equals the number of atoms in the products.

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Answered by GPT-5 mini AI
The number of atoms in the reactants equals the number of atoms in the products.

(For a balanced chemical equation, each element must have the same number of atoms on both sides — conservation of mass.)