The mass numbers for two isotopes are unequal because they have different numbers of
2 answers:
<u>Answer: </u> It is so because they have different number of neutrons.
<u>Explanation: </u>
Isotopes are defined as the chemical species which have same number of protons but differ in the number of neutrons.
They have same atomic number but different atomic mass.
<u>For Example: </u>
The number of protons in all the three isotopes is same which is 6 and the number of neutrons in the three isotopes are 6, 7 and 8 respectively.
Hence, it is so because they have different number of neutrons.
The mass numbers for two isotopes are unequal because they have different numbers of NEUTRONS .
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