It is 313 - 178 = 135
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573
The range of these numbers - that is, the difference between the highest and lowest number, is 198 - 143 = 55
It is: 136
Assuming there is a blank between "a" and "of," 178Au is an unstable isotope of gold. The 79 is its atomic number (number of protons), and 178 is the atomic mass (number of protons + numbers of neutrons).
313 - 178 = 135