Why is the atomic mass of many elements not a whole number? A. Elements are unstable. B. An element may have isotopes with different numbers of neutrons. C. The atomic mass includes all the electrons. D. Isotopes are always expressed in decimals.

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Why is the atomic mass of many elements not a whole number? A. Elements are unstable. B. An element may have isotopes with different numbers of neutrons. C. The atomic mass includes all the electrons. D. Isotopes are always expressed in decimals.

Earth Sciences
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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
yeah
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

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