Chemistry - Mole Concept Question with Solution | TestHub

For ${}^{20}\text{Ne}$, the atomic number is $10$ and the mass number is $20$.

Number of protons $=10$
Number of electrons $=10$
Number of neutrons $=20-10=10$

Total number of protons, neutrons, and electrons in one atom of ${}^{20}\text{Ne}=10+10+10=30$

Number of atoms in $1$ mole of ${}^{20}\text{Ne}=6.022\times 10^{23}$

Total number of protons, neutrons, and electrons in $1$ mole $=30\times 6.022\times 10^{23}=1.8066\times 10^{25}$

Answer: $1.8066\times 10^{25}$