Atomic Number and Mass Number
Isotope Symbol Atomic Number Mass Number Protons Neutrons 1940 9 19 9 10 918 19 40 19 21 S-31 16 31 16 15 Do all isotopes of an element have the same atomic number? Explain your answer. YES. Atomic number is the number of protons in the atom, and the number of protons identifies that atom as a particular element. ................
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