Francium is a radioactive chemical element; the most known and stable isotope, 223Fr, has a half life of only 21,8 min. It is difficult in this case for francium to accumulate in the earth crust; the total quantity of francium in the earth crust is only ca. 30 g !
Marie Curie tried to discover radium as part of her research into radioactivity. She isolated radium in 1898 along with her husband Pierre Curie by extracting it from uranium ore. Their work on radium led to groundbreaking discoveries in the field of radioactivity.
Ferdinand Magellan did not discover any part of Canada
Discovered is a verb. It's the past tense of discover.
Marie Curie was the woman who discovered the elements polonium and radium, both of which are on the periodic table. She was a pioneering physicist and chemist who conducted groundbreaking research on radioactivity.
Although Ferdinand Magellan discovered and named the Pacific Ocean, he did not discover any part of Australia.
The word discover is a verb. It means to expose or to uncover.
DISCOVER
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No, Henry Hudson did not discover Holland, nor any other part of the Netherlands.
To discover the medical plant you have to take a villager to the middle top part of the screen.
Although the Portuguese are believed to be the first Europeans to discover Australia, they did not settle any part of it or live here prior to Britain colonising the continent.
He discover California and part of Mexico