He was one of the first to suggest the existence of isotopes. He also discovered the element ytterbium (Yb) and co-discovered gadolinium (Gd).
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Identify learning gaps and misconceptions with this set of worksheets offering three levels of support
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Identify learning gaps and misconceptions with this set of worksheets offering three levels of support
Identify learning gaps and misconceptions with this set of worksheets offering three levels of support
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