Marie Curie studied the radiation of all compounds containing the known radioactive elements, including uranium and thorium, which she later discovered was also radioactive. She also found out that:
- you can exactly measure the strength of the radiation from uranium;
- the intensity of the radiation is proportional to the amount of uranium or thorium in the compound - no matter what compound it is;
- the ability to emit radiation does not depend on the arrangement of the atoms in a molecule; it must be linked to the interior of the atom itself - a revolutionary discovery!
When she realized that some uranium and/or thorium compounds had stronger radiation than uranium, she made the following hypothesis: there must be an unknown element in the compound which had a stronger radiation than uranium or thorium. Her work aroused the interest of her husband, Pierre Curie, who stopped his own research on crystals and joined the "detective work" with his wife. And Marie was proven right: in 1898 the Curies discovered two new radioactive elements: radium (named after the Latin word for ray) and polonium (named after Marie's home country, Poland).
I’m not totally sure but I think the answer is C
The Maya civilization was one of the most leading native societies of Mesoamerica. Not like other dispersed indigenous inhabitants of Mesoamerica, the Maya were positioned in one geographical block casing all of the Yucatan Peninsula and modern-day Guatemala; Belize and portions of the Mexican states; and the western portion of El Salvador and Honduras. This deliberation presented that the Maya continued moderately protected from attack by other Mesoamerican peoples.
The world population DOUBLED. Thanks Industrial Revolution. Thomas Edison brought the world to light at night! Massive factories drew millions to cities–and people were able to ride there on new steam locomotives.
The impact on Spain of the conquests by Hernan Cortes and Francisco Pizarro was that they brought great wealth to Spain.
<h3>How did Hernan Cortes and Francisco Pizarro affect Spain?</h3>
Hernan Cortes and Francisco Pizarro engaged in the conquest of two prominent empires in the Americas including the Aztec and the Inca empire.
These empires were extremely rich and when they were defeated, their wealth was claimed by Spain which brought great wealth to the Spanish.
Find out more on Hernan Cortes at brainly.com/question/14681292
#SPJ1
