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An unknown element has two stable isotopes, 50X and 51X. The relative abundance of these isotopes is 0.25% and 99.75%, respectively. 50X has an atomic mass of 49.947, while 51X has an atomic mass of 50.943. Determine the atomic mass and identity of X.

An unknown element has two stable isotopes, ⁵⁰X and ⁵¹X. The relative abundance of these isotopes is 0.25% and 99.75%, respectively. ⁵⁰X has an atomic mass of 49.947, while ⁵¹X has an atomic mass of 50.943. Determine the atomic mass and identity of X.