• Nuclear reactions can be represented by balanced equations of nuclei in the AZX form

AZX notation for atomic nuclei

• The top number A represents the?nucleon?number or the?mass?number
  • Nucleon number (A)?= total number of?protons and neutrons?in the nucleus
• The lower number Z represents the?proton?or?atomic?number
  • Proton number (Z)?= total number of?protons?in the nucleus

Step 1: ???????????Balance the nucleon numbers (the top number)

235 + 1 = 95 + 139 + x(1) + 7(0)

Step 2:??????????? Rearrange to find the value of x

x = 235 + 1 ? 95 ? 139 = 2