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barry barry
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11 years ago
An isotope of Oxygen has 8 protons, 10 neutrons, and 8 electrons. What is the atomic mass of this isotope?
A) 16
B) 18
C) 21
D) 26
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saviosavio
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11 years ago
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barry Author
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#2
11 years ago
@Savio, TY

Marking this solved.
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11 years ago
Atoms of the same kind have the same atomic number. However, it is the mass number that can change among atoms of the same kind. These are called isotopes.

So, an oxygen with 8 protons and 10 neutrons (2 more from the 8 in normally has) has an atomic mass of 18
Source  Chem Major
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