Robert Wilhelm Bunsen (1811-1899) invented many lecture-room and laboratory appliances, most famously the Bunsen burner. It was the first element discovered by spectrum analysis. Radium salts have been used as radiation sources in the treatment of cancer but are gradually being replaced in such therapy by cobalt and cesium.įacts about the History of the Discovery of Cesium ElementĬesium was discovered by Fustov Kirchoff and Robert Bunsen in 1860 from mineral water found in Dürkheim, Germany. Interesting information on the Medical Uses of Cesium, Health and Treatments. Medical Uses of Cesium - Health and Treatments What is Cesium? Occurrence of the Cesium ElementĬesium is found in the mineral pollux, or pollucite, which occurs on the island of Elba, in South Africa, in the United States in Maine and South Dakota, and in Manitoba, Canada.Ībundances of the element in different environments
Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals. Alkali metals are soft, malleable, ductile, and are good conductors of heat and electricity. An Element classified as an Alkali Metal is a very reactive metal that does not occur freely in nature. Cesium is classified as an "Alkali Metal" and located in Group 1 elements of the Periodic Table. What is Cesium? Periodic Table Group and Classification of the Cesium ElementĮlements can be classified based on their physical states (States of Matter) e.g. The word Caesium originates from the Latin word 'caesius' which means "sky blue" from the bright blue lines in its spectrum. To get just the number of neutrons you take the difference between protons and mass number, thus #137-56=81#.What is Cesium? Origin / Meaning of the name Cesium
Number of neutrons in caesium plus#
And the #137# for the mass number designates #137# total protons protons plus neutrons. Thus the "barium" in "barium 137" means #56# protons.
When the element is barium, that means the aomic number is #56# which you see by looking for barium on a periodic table (or nowdays by entering "barium" into an online search engine). That's why chemists commonly identify an isotope with the element, which implies its atomic number, and then the mass number. Mass number is also a key property of atoms because we need to know the masses of atoms to understand how a given amount of material we weigh out will react - for instance, how much carbon dioxide gas can we get out of 10 grams of calcium carbonate and how much hydrochloric acid do we need to get all the gas? We can write a balanced equation #"CaCO"_3+2 "HCl" rarr "CaCl"_2+"H"_2"O"+"CO"_2#, but to match that with what we weigh we need to know atomic masses. This is roughly proportional to the total mass of the atom. Mass number is the number of protons plus neutrons. The atomic number determines what an element is chemically, for the number of protons determines the number of electrons needed to balance the charges in an atom, which in turn determines the electron configuration the atom will adopt. Two numbers are used to identify a nucleus:Ītomic number - number of just protons in the nucleus.
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