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A quantity of an. element. is a bunch of atoms, all of which have the same number of protons in their nuclei.
http://wiki.answers.com/Q/What_is_a_substance_whos...
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A substance whose atoms have the same number of protons in their nucleus are isotopes of each other.
http://wiki.answers.com/Q/What_is_a_substance_whos...
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Answers.com: One and the same http://www.answers.com/topic/one-and-the-same
http://wiki.answers.com/Q/A+substance+in+which+one...
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A pure substance in which all the atoms have the same atomic number or number of protons is an. element.
http://wiki.answers.com/Q/What_is_a_pure_substance...
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