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No element is a mixture of any chemical type, because by definition an element is a chemical substance that can not be broken down into simpler substances by chemical means. However, many elements can be separated by physical means into isotopes that differ from one another in atomic number. If these are considered mixtures, then many naturally occurring elements can be considered homogeneous mixtures.

The element of lowest atomic number that has more than one stable isotope making up at least 5 % of the naturally occurring atoms is lithium, and the next lowest such element is boron. The next lowest such element is magnesium, which has three isotopes all satisfying this criterion. Titanium, with atomic number 22, has five such isotopes. Zinc, element 30, has five naturally occurring isotopes, three of which constitute more than 15 % each of the atoms in naturally occurring zinc. Germanium naturally contains five isotopes, each of which constitutes at least 5 % of the atoms, and 3 of these isotopes constitute at least 20 % of all the atoms each.

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10y ago

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