what are elements ? write two examples of elements .
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An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world. Examples of elements include iron, oxygen, hydrogen, gold, and helium. Atomic Number. An important number in an element is the atomic number.
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An element is a substance whose atoms all have the same number of protons. Another way of saying this is that all of a particular element's atoms have the same atomic number.
Two examples of elements are:
(1) hydrogen
(2) sodium
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