The size of atomic nuclei is of the order

CHEMISTRY · Multi-part · A Level · Chemistry · Atomic structure · Atomic structure

Problem

10^{-15} \text{ m}

, and the size of atoms is of the order

10^{-10} \text{ m}

. The mass of a proton is given as

m_p = 1.67 \times 10^{-27} \text{ kg}

, and the rest mass of an electron,

m_e

, is given as

9.1 \times 10^{-31} \text{ kg}

. (1) Calculate the ratio of

\frac{m_p}{m_e}

. (2) Is it reasonable to assume that the mass of an atom is very nearly the same as the mass of its nucleus?