Question

How do you write balanced equations

A. Neutron emission by 88Br

B. Electron absorption by 116Sb

C. Positron emission by 184Hg

D. Alpha emission by 229Th

E. Neutron capture by 200Hg

Answer 1

It's SUPPOSED to be atomic number as a lower left subscript and mass number as upper left superscript BUT that's difficult to do on this board so what I do is write the atomic number before the symbol as in 35Br and mass number after the symbol as in 35Br80 etc.
The secret to writing these is to make the subscripts add up and the superscripts add up.
35Br88 ==> 0n1 + yXz
Note: the neutron has a zero charge and a mass of 1. We are looking for element X with atomic number y and mass number z.
35 = 0 + y; therefore, y must be 35
88 = 1+z; therefore 87 = z
Since atomic number is 35 it still is Br and the full equation is
35Br88 ==> 0n1 + 35Br87

51Sb116 + -1e0 = yXz
51-1 = y; therefore, y = 50
116 + 0 = z; therefore, z = 116
element #50 is Sn so the full equation is
51Sb116 + -1e0 = 50Sn116

I'll leave the others for you.