Isotopes+&+Atomic+Mass

Isotopes and Mass Number (Copy) 1 Atomic number is the same in every atom of an element. 2 Atomic mass is not the same in every atom of an element. 3 Not all atoms of an element have the same number of neutrons. 4 Different numbers of neutrons will give atoms of the same element different masses. 6 Part of a proton or neutron is not possible. 5 Atomic masses are decimals because average mass of many atoms is given.

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Easier way to draw the nuclei: Isotopes Atoms of all isotopes of carbon contain 6 protons and 6 electrons, but they differ in their number of neutrons. Carbon-12 is the most common isotope. .............Carbon-12...........................Carbon-13...........................Carbon-14



.........6 neutrons.............................7 neutrons..............................8 neutrons