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).
Answer:
sites with statistics and charts
Explanation:
A. It gave the colonists a chance to govern themselves. ... A. It gave the colonists a chance to govern themselves. The Tuscarora War between settlers and American Indians in North Carolina was caused by. A. local tribes attacking Jamestown and burning it to the ground.
Answer:
The four-level of the organization are Precinct, County, State, and National.
Explanation:
<u>Precinct</u>:
- The region of a boundary seems to be an electoral geographical location defined by statute.
<u>County</u>:
- Counties may come in different sizes as well as distinguish a territory from one provincial capital by another.
<u>State</u>:
- States, which cannot be named as states throughout political motivation, are also known as republics as well as governing bodies that support the implementation or basis of either a nation.
<u>National</u>:
- It's the one who commits fidelity or becomes protected by a government, regardless of the individual or subject's highly institutional statuses.
