![]() ![]() Since the neutrons have mass, the nuclei and accordingly also the atoms of an element having different numbers of neutrons, have different masses.Īny two atoms of any one element ( which include in their nuclei an equal number of protons ) may, therefore, have a different number of neutrons. ![]() ![]() The nuclei of most atoms also include a variable number of neutrons, elementary particle that have a definite mass but are not electrically charged. Each atom of an element includes equal numbers of positive and negative electrically charged particle positively charged protons in the nucleus and surrounding the nucleus, negatively charged electrons. The basic material units of each chemical element are the almost identical atoms. › ▀ ▀ Hdderase 3 3 Isotopes Of Oxygen ▀ ▀ ![]()
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