Discovered by Marie Curie when she noticed that there was some yet unknown more radioactive element in their raw samples, after uranium had already been separated.

Figure 60. The uranium-238 decay chain is the main source of naturally occurring radium. Source.

Video 132. "The epic story of radium" by Institut de Radioprotection et de Sûreté Nucléaire - IRSN (2013) Source.

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Chemical element | 0, 476, 27
Chemistry | 136, 1k, 61
Natural science | 0, 41k, 934
Science | 0, 45k, 1k
Ciro Santilli's Homepage | 238, 163k, 3k

Radium (Ra, 88)

Ancestors