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The atomic radius is the distance from the center of the atomic nucleus to the outermost electronic orbital of an atom in equilibrium.

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It was discovered by Marie Curie and her husband Pierre Curie

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The radium was discovered on December 21 of 1898.

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While studying the uraninite, they removed the uranium and found that the remaining material was still radioactive.

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When Marie graduated she and her husband Pierre focused on radioactivity. They began by studying pitchblende, a mineral that had uranium but showed even greater signs of radioactivity, so the first step was to isolate other radioactive components.
In this way they discovered thorium, later polonium and then radium.

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The most famous book related to this topic was written by Marie Curie called: Recherches sur les substances radioactives

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The most successful film about Marie Curie is called Radioactive, but if you search thoroughly you can find a few more that are only in the original language.