he knew that because of the new elements that were formed and he figured that the atoms would pop back and forth and leave gaps in between them.
the periodic table of elements In this table, elements having similar chemical properties are stacked up. The chemical properties are determined by how many free bonds an atom has open, which is related to how many electrons are in that element's outer shell.
Only some elements were discovered during the life of Mendeleev.
No, helium was not included in Mendeleev's original periodic table. It was discovered in 1868, a year after Mendeleev's table was published in 1869.
No He didn't knew. Mendeleev proposed his periodic table in 1869 and he died in 1907. Protons was discovered by Rutherford after that (in 1920).
He could predict other elements because there was an obvious gap, but he couldn't predict the noble gases because he didn't realize that there was going to be an 18th group since none of them were yet discovered. When he first started organizing the periodic table, the pattern still made sense even without the noble gases.
the periodic table of elements In this table, elements having similar chemical properties are stacked up. The chemical properties are determined by how many free bonds an atom has open, which is related to how many electrons are in that element's outer shell.
Only some elements were discovered during the life of Mendeleev.
The history is that Dymitry Mendeleev is the inventer of long time periodic table that's all i know
Dmirtri Mendeleev made the first periodic table. It was organized by elements according to the atomic mass. < notice it is atomic mass not number>
No, helium was not included in Mendeleev's original periodic table. It was discovered in 1868, a year after Mendeleev's table was published in 1869.
Dimtrii Mendeleev made the first Periodic Table. dmitry mendeleev
Mendeleev laid the foundation for theperiodictable that we know today
No He didn't knew. Mendeleev proposed his periodic table in 1869 and he died in 1907. Protons was discovered by Rutherford after that (in 1920).
He could predict other elements because there was an obvious gap, but he couldn't predict the noble gases because he didn't realize that there was going to be an 18th group since none of them were yet discovered. When he first started organizing the periodic table, the pattern still made sense even without the noble gases.
They were not discovered at that time.
He invented the periodic table. You must know what that means; he was the father of basic chemistry. Actually, he didn't discover the periodic table. He just arranged the only elements he had available in his day (not a lot) and arranged them based on patterns of # of protons, electrons, reactivity, etc. He didn't have an in-depth knowledge yet of electron configuration ;however, his "guess" turned out to have so many great implications that we now use his invention everyday everywhere.
mandeleev didn't know spaces in the Periodic Table because he doesn't arrange it john Kepler arrange it most of mendeleev discoveries of elements are few most of other element where discover by other scientist after him in 19th century