Answer: 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
The answer to the question is Italy
Answer:
It comprises the first seven years of the period of warfare that was continued through the Napoleonic Wars until Napoleon’s abdication in 1814, with a year of interruption under the peace of Amiens (1802–03). The end of 1799 may be conveniently taken as the dividing point between the Revolutionary and Napoleonic phases of the conflict, since in that year the consulate of Napoleon Bonaparte was established
Answer:
Great Britain, France, and Spain
Explanation:
Great Britain: because it controlled Canada and refused to abandon forts the Ohio Valley, even though it belonged to the U.S.
France: French Revolution happening in Europe at this time put President Washington in a difficult problem of deciding which side to take.
Spain: to the south and west, Spain controlled Florida and Louisiana.
