changes the mass number of the element by -4 and the atomic number by -2 so the remaining nucleus will be \(_{90}^{234}?\). A periodic table shows that element number 90 is thorium ...

Alpha decay (two protons and two neutrons) decreases the mass number of the element by four and decreases the atomic number by ... that element number 90 is thorium, \(_{90}^{ ...

Kailash Agarwal, nuclear fuel cycle facilities specialist at the International Atomic Energy Agency, said in 2023."Many countries consider thorium as both a viable and very attractive option for ...