Hydrogen Nuclear Spin Isomers

What is the key difference between parahydrogen and orthohydrogen?

What happens to the ratio of para form to ortho form in hydrogen gas when cooled to 20K?

How are the two nuclei in a dihydrogen molecule different?

Which type of nuclear spin does the proton of a hydrogen atom possess?

What defines isotopes in chemistry?

What is the nuclear spin isomer called in dihydrogen where the two nuclei may be parallel or opposed?

Which element is the most abundant in the universe?

At room temperature, dihydrogen is relatively unreactive because:

Which element does hydrogen NOT form compounds with?

What is the percentage of hydrogen in the Earth's crust on an atom basis?

Which property describes the angular momentum of electrons in a molecule?

What is the main factor determining the chemical behaviour of hydrogen isotopes?

Which isotope of hydrogen is radioactive with a half-life of 12 years?

In which physical property do deuterium and tritium show a quantitative difference compared to protium?

What is the term for the phenomenon where rats can distinguish between D2O and H2O, preferring the latter?

Which of the following hydrogen isotopes has the highest boiling point?

What does the difference in mass between hydrogen isotopes mainly lead to?