The mussing parts are;
a)40/19K b) 230/90Th c) 35/15 P d) 234/90Th e) 4/2He f) 0/-1e
Atomic and mass decline due to alpha decay, which yields an alpha particle made up of two protons and two neutrons. It is frequently used in heavy nuclei to produce a more stable structure. We can find both alpha and beta decay here.
Conversely, a neutron transforms into a proton or vice versa and produces a beta particle during beta decay. This method aids in changing the nucleus' proton-to-neutron ratio.
a) 20 -1 = 19
Note that the mass number does not change
b) mass number = 4 + 236 = 240
Charge = 88 + 2 = 90
c) Mass number does not change
Charge = 14 + 1 = 15
d) Mass number = 238 - 4 = 234
Charge = 92 - 2 = 90
e) Mass = 110 -4 = 106
Charge = 53 - 2 = 51
f) The mass number does not change
Charge = 57 -1 = 56