The question is nonsense. What constitutes a "discovery"? Is turning over a rock and finding a worm a "discovery"? If you could be more specific ("how many elements did Marie Curie discover?"), then it might be possible to give a sensible answer (two, polonium and radium; on a related topic, she didn't discover thorium, but she was one of the first people to notice that it was radioactive).
Radium and polonium have many applications but they are not so important to affect us today.
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Her discovery of radium changed the way people look and try to treat cancer. Radium is used in x-rays and polonium is used in many drugs, like tobacco. Marie Curie has contributed all these things to the society.
mostly likely millions or thousands.
Do not know
Radium has 88 protons.
Radium has seven electron shells; the valence of radium is 2+.
The question is nonsense. What constitutes a "discovery"? Is turning over a rock and finding a worm a "discovery"? If you could be more specific ("how many elements did Marie Curie discover?"), then it might be possible to give a sensible answer (two, polonium and radium; on a related topic, she didn't discover thorium, but she was one of the first people to notice that it was radioactive).
There is no such atom as Radium 87 - it is Radium 88 and thus has 88. Francium is 87.
Radium has one valence electron.
Radium has two valence electrons.
The Radium Pool has 188 pages.
The neutral radium atom has 88 electrons, the radium cation has 86 electrons.
100
Radium has seven electron shells.
Radium has today 33 isotopes and 12 nuclear isomers.