balanced equation for the reaction between solid chromium(III) oxide and solid carbon to produce solid chromium and carbon dioxide gas.

Explanation:

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In this case, since chromium (III) oxide and solid carbon are respectively Cr₂O₃ and C, the corresponding chemical reaction to yield solid chromium and oxygen is:

However, since two chromium atoms are present at the reactants yet one at the products and three oxygen atoms at the reactants and two at the products, we need to balance it as follows:

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it's c. elements are placed in rows based on how may valencies electrons have.

a electronegativity decreases beacuse the size of nucleus is bigger.