Which of the first four radioisotopes in the decay series has the longest half-life? Pa-234

Th-234

U-234

U-238

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

it takes on an electronical energy

girl imma just put my comment here because i need a couple point okurrttt