It is: 136
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It is 313 - 178 = 135
573
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
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 178 is an even number.