Forget hyperneutrinos, we’re on pseudo-atoms now

When chemists think of the neutral radical ammonium, few think of it as behaving like an alkali metal. However, in many ways, particularly its electronegativity, which can be transferred from compound to compound, it acts like a pseudo-atom akin to sodium, according to computations by a team from the UK and the US.

My full story in Chemsistry World – Ammonium radical is atomic pretender.

I just had an additional email from Maciej who highlights an important point from his study: “Even though ammonium is isoelectronic with sodium, its electronegativity is most similar to potassium, while the ionic radius to rubidium.”