Considering the definition of mass number, the mass number of the ion is 209.
All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.
Mass Number is the integer equal to the sum of protons and neutrons present in the nucleus of an atom. This is:
Mass number = (number of protons) + (number of neutrons)
It is represented by the letter A.
In this case:
-
number of protons= 83
- number of neutrons= 126
So:
Mass number = 83 + 126
Solving:
Mass number= 209
In summary, the mass number of the ion is 209.
Learn more:
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brainly.com/question/11837355?referrer=searchResults
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