Discovery of the astatine, radon, francium, and radium isotopes

TL;DR

This paper reviews the discovery history of 39 astatine, 39 radon, 35 francium, and 34 radium isotopes, summarizing their first identification methods and publication details.

Contribution

It provides a comprehensive overview of the discovery of these isotopes, including production and identification techniques for each.

Findings

39 astatine isotopes discovered

39 radon isotopes discovered

35 francium isotopes discovered

Abstract

Currently, thirty-nine astatine, thirty-nine radon, thirty-five francium, and thirty-four radium isotopes have so far been observed; the discovery of these isotopes is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented.