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Mass number= The total number of protons and neutrons in the nucleus of an atom.
Example: Carbon has 6 protons and 6 neutrons therefore Carbon’s mass number =12.
Round the Atomic mass to get the Mass number!
Atomic mass= the average of all the isotopes of a particular element found in nature.
Isotope= atoms of the same element that have the same number of protons but different number of neutrons.
13 Al 26.98154 What is the atomic # of Aluminum?_______ What is the atomic mass of Aluminum?_______ What is the mass number of Aluminum?_______ How many protons are found in the Aluminum?__ Electrons?_____ Neutrons?___________