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Samples of elements that vary in their isotopic composition can also defy the law of definite proportions since the masses of two different isotopes of an element are different. Natural polymers are also known to disobey the law of constant proportions.
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Elements can be classified as metals,metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Groups are numbered 1–18 from left to right.
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