Everything is made of atoms and every atom has a nucleus composed of positively charged particles called protons, with some neutrally charged particles known as neutrons. The particles that orbit around the nucleus that is negatively charged are known as________.
An atomic nucleus A is composed of 84 protons and 128 neutrons.
The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a β - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?