Why is the atomic mass of many elements not a whole number?
Elements are unstable.
An element may have isotopes with different numbers of neutrons.
The atomic mass includes all the electrons.
Isotopes are always expressed in decimals.
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The main reason that the atomic mass of elements is not a whole number is due to the presence of different isotopes - these have the same number of protons in the nucleus but a different number of neutrons - so their masses are different even though chemically they are identical.
The two isotopes of Chlorine are 35Cl- (75.77%) and 37Cl (24.23%) giving an overall "average" mass of 35.4527.
I am thinking it would be an element may have isotopes with different numbers of neutrons
so it would be b
ok so i will fan one of u and then someone fan the other one that i didnt
i mean medal
so in other words it is B
and thx for yalls help i have more i need help with so i will close this and then start a new one