No, this set of values is impossible.
Work Step by Step
1. Is the atomic number equal to the number of protons? - Yes, they are equal. (25) 2. Is the sum of the number of protons and neutrons equal to the mass number? Sum: $25 + 29 = 54$ Mass number: 53 - No, they aren't equal ($54 \ne 53$). - Therefore, this set of values isn't possible.