A sample of 0.262 mol of a metal M reacts completely with excess fluorine to form 20.5 g of MF2. What element is represented by the symbol M? (Give its symbol).

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".