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Recall that atomic number is the number of protons in the nucleus of the element. Also recall that species having the same number of protons and different number of neutrons are termed as isotopes. Isotopes are all considered the same element. $\ce{^{12}C}$ and $\ce{^{13}C}$ are both very much carbon. You may argue that its the definition that we chose that ...


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The atomic number of an element equals to the number of electrons an atom of that element have in their neutral state. As you know the chemical properties of an element always depends on the number of electrons an atom of the element have. So two atoms which have same atomic number (which means they have same number of electrons) will always show same ...


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