Structure of the Atom · Paper 1 — Free Physics SL Practice Questions

A sample of naturally occurring chlorine contains two isotopes: chlorine-35 with an abundance of 75% and chlorine-37 with an abundance of 25%. The isotopic masses are $34.97 \text{ u}$ and $36.97 \text{ u}$ respectively. What is the relative atomic mass of this chlorine sample?

In the quantum mechanical model of the hydrogen atom, an electron probability cloud is represented as a region of varying dot density around the nucleus. What does a region of higher dot density indicate?

A mass spectrometer detects three isotopes in a neon sample. The mass of each isotope is taken as equal to its mass number. Isotope — Relative abundance neon-20 — 90.0% neon-21 — 0.3% neon-22 — 9.7% What is the relative atomic mass of this neon sample?

Naturally occurring neon contains two stable isotopes: $^{20}$Ne with fractional abundance $0.905$ and atomic mass $19.99\text{ u}$, and $^{22}$Ne with fractional abundance $0.095$ and atomic mass $21.99\text{ u}$. What is the relative atomic mass of naturally occurring neon?