5 replies
lahar
over 13 years ago
salman
over 13 years ago

"An isotope refers to atoms of an element which differ only in the number of neutrons they have. An element is uniquely defined by the number of protons it has. For example an atom with 6 protons in its nucleus is called a carbon atom. The number of protons is called the atomic number and it is the same for all atoms of a particular element. "
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