Final answer:
The atomic mass of the element with atomic number 113 could be estimated to be roughly around 283, falling between the known atomic masses of its adjacent elements, ununbium (277) and ununquadium (289).
Step-by-step explanation:
The student is asking about the atomic mass prediction of an undiscovered element with an atomic number 113 based on the atomic masses of the adjacent elements ununbium (atomic number 112) and ununquadium (atomic number 114). While predicting the exact atomic mass of undiscovered elements is not straightforward due to various isotopes and their stability, we can make an educated guess by considering the trend in the atomic masses of the adjacent elements mentioned.
If ununbium has an atomic mass of 277 and ununquadrium has an atomic mass of 289, we might expect the atomic mass of element 113 to fall between these two values. Given the pattern of increasing mass with increasing atomic number, we could estimate that the atomic mass of the element with atomic number 113 would be slightly less than the average of the two known elements' masses. Therefore, it could be roughly estimated to be around the middle of 277 and 289, which is 283.