Question

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.

Answer 1

@TheFlash17

Answer 2

@yeebeen8or

Answer 3

im looking right now

Answer 4

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.

Answer 5

I am thinking it would be an element may have isotopes with different numbers of neutrons

Answer 6

so it would be b

Answer 7

yeah

Answer 8

ok so i will fan one of u and then someone fan the other one that i didnt

Answer 9

i mean medal

Answer 10

so in other words it is B

Answer 11

and thx for yalls help i have more i need help with so i will close this and then start a new one