Which can have either a positive or a negative charge when they are released during radioactive decay?

B. beta particles

Explanation:

Sorry if this answer doesn't answer your original question or if it's late. But I hope other people will find this helpful! :)

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.