number of fundamental particals does not conserved in nuclear reaction

In nuclear reactions :

Nuclear Reactions

Nuclear Reactions

Problems on nuclear reactions

If both the numbers of protons and neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction?

The number of alpha -and beta -particles emitted in the nuclear reaction, ._(90)Th^(228) to ._(83)Bi^(212) , respectively are

The number of alpha and beta particles emitted in nuclear reaction ""_(90)Th^(228) rarr ""_(0)Th^(228) are respectively