Final answer:
The atomic mass of the new atom is -252. The atomic number of the new atom is 98. The symbol of the new atom is Cf. The type of decay demonstrated here is ß decay.
Step-by-step explanation:
The atomic mass of the new atom can be determined by subtracting the atomic mass of the parent atom from the atomic mass of the daughter atom. In this case, the parent atom, 252/99Es, has an atomic mass of 252. The daughter atom, A/Z X, has an atomic mass of 0. Therefore, the atomic mass of the new atom is 0 - 252 = -252.
The atomic number of the new atom can be determined by subtracting 1 from the atomic number of the parent atom. In this case, the parent atom, 252/99Es, has an atomic number of 99. Therefore, the atomic number of the new atom is 99 - 1 = 98.
The symbol of the new atom can be determined by looking up the element with atomic number 98 on the periodic table. In this case, the new atom is element Cf (Californium).
The type of decay demonstrated here is ß decay, as indicated by the presence of the ß symbol in the equation.