Demitri Mendeleeve was a Russian chemist who invented the first periodic table in 1869. The periodic table he made was very different from the modern day periodic table we know today.
Henry Moseley updated Mendeleev's version of the periodic table in 1915. This is more like the periodic table that we know and use today. The only difference is that there has been many more elements added.
Mendeleeve also had predicted a lot of the characteristics and properties of elements that would fill up some of the spaces that he left in his periodic table. Many scientists were later able to find out if these predictions were correct or not. As it turned out, most of Mendeleeve’s predictions were correct and that made it easier because they could just leave that element in that space.
Mendeleeve was very smart when he made his periodic table. He knew …show more content…
They have one loosely bound electron in their outer shell. Alkali metals also have low ionization energies and that results in their high reactivity and metallic properties. Alkali metals react with nonmetals, especially halligans.
Another group is the alkali earth metals. There are not many of them. They are very similar to metals. They also have some similar properties to alkali metals, like their properties depends on how easy the electrons could be lost. The alkali earth metals have two valence electrons in their outer shell that are not bound to the nucleus very tight.
Transition metals are very hard to identify and find on the periodic table. They have many of the same properties of metals. They are very hard and have extremely high melting and boiling points. Transition metals have “d” electrons that are loosely bound. This contributes to the high malleability and electrical conductivity. They have low ionization energy levels and have a wide range of oxidation states. This allows them to form ionic and partially ionic
Henry Moseley updated Mendeleev's version of the periodic table in 1915. This is more like the periodic table that we know and use today. The only difference is that there has been many more elements added.
Mendeleeve also had predicted a lot of the characteristics and properties of elements that would fill up some of the spaces that he left in his periodic table. Many scientists were later able to find out if these predictions were correct or not. As it turned out, most of Mendeleeve’s predictions were correct and that made it easier because they could just leave that element in that space.
Mendeleeve was very smart when he made his periodic table. He knew …show more content…
They have one loosely bound electron in their outer shell. Alkali metals also have low ionization energies and that results in their high reactivity and metallic properties. Alkali metals react with nonmetals, especially halligans.
Another group is the alkali earth metals. There are not many of them. They are very similar to metals. They also have some similar properties to alkali metals, like their properties depends on how easy the electrons could be lost. The alkali earth metals have two valence electrons in their outer shell that are not bound to the nucleus very tight.
Transition metals are very hard to identify and find on the periodic table. They have many of the same properties of metals. They are very hard and have extremely high melting and boiling points. Transition metals have “d” electrons that are loosely bound. This contributes to the high malleability and electrical conductivity. They have low ionization energy levels and have a wide range of oxidation states. This allows them to form ionic and partially ionic