If the Th isotope emits an alpha particle,what would be the atomic number of the resulting atom?

Question

If the  Th isotope emits an alpha particle,what would be the atomic number of the resulting atom?

Quizplus · Accepted Answer

The isotope 11ea71d6_78d5_0e0d_91e5_395c6f9eb1d2_TB6110_11 Th has an atomic number of 90. When it emits an alpha particle, it loses two protons and two neutrons. The atomic number of an element is equal to the number of protons it has, so after emitting an alpha particle, the resulting atom would have an atomic number of 88. Therefore, the best choice is B) 88.

If the Th Isotope Emits an Alpha Particle,what Would