The diagram below shows a simplified Bohr model of an atom, showing two main regions labeled Region X and Region Y.
a.[1]
Identify the subatomic particles that are located within Region X.
b.[1]
Identify the two types of subatomic particles that are located inside Region Y.
c.[2]
Explain, in terms of the relative masses of these subatomic particles, why almost all of the mass of this atom is concentrated within Region Y.
d.[2]
Look at these two symbols representing different oxygen atoms:
816Oand 818O^{16}_{\ 8}\text{O} \quad \text{and} \quad ^{18}_{\ 8}\text{O} 816Oand 818O
State the relationship between these two oxygen atoms and explain your answer in terms of their constituent subatomic particles.