An Unknown Element with Three Occurring Isotopes

Isotopes of the Unknown Element

Isotope 1: 23.99 amu (Atomic Mass Unit), 78.7% abundance

Isotope 2: 24.89 amu, 10.13% abundance

Isotope 3: 25.98 amu, 11.17% abundance

An unknown element has three occurring isotopes. What is the element? The unknown element has an atomic mass of 24.31 amu and is identified as chromium.
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