The Russian chemist Dmitri Mendeleev was the first scientist to make a Periodic Table similar to the one used today.
Dmitri Mendeleev in 1869; but because the history of this discovery is more complicate see the link below.
Dimitri Mendeleev
Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, andarrangedthem so that groups of elements with similar properties fell into vertical columns in his table.
It took many years to discover these elements. Hundreds of thousands worked and arranged the Periodic Table of Elements.The basic design of the periodic table was thought up by Dmitri Mendeleev. It was his idea to arrange the elements according to atomic mass (because this gave repeating patterns of properties). Later it was discovered that atomic charge was what was really important. Eventually the gaps Mendeleev left were filled in by the discovery of more elements, so while many scientist contributed to the modern periodic table Mendeleev is considered to have invented it.
The greek prefix for water is "Hydro". Knowing this, put the two together, fudge the pronunciation, and..... HYDROGEN (H2)
Atomic Number
A group (also known as a family) is a vertical column in the periodic table of the chemical elements and the group number tells you what group it is in.
1869 by Mendeleev
Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, andarrangedthem so that groups of elements with similar properties fell into vertical columns in his table.
in ascending order by atomic number (number of protons) of an atom of a particular element. previously, the periodic table had elements ordered by atomic mass.
Russian chemist Dmitri Mendeleev
john Dalton died in 1854. The first periodic table was published in 1869. But john Dalton did put forward the first clear idea of atoms and molecules.
I know that there are over a hundred but you can't always say because when more elements are discovered they are put on the periodic table on the standard table there are 118,
Gadolinium is in the middle of the lanthanide sequence on the periodic table. (The lanthanide sequence is the skinny part at the bottom that, in some periodic tables, is put off to the side.)
Water and chlorine.
So people know!
No,its not Dmitri Mendeleev.Dmitri Mendeleev create the first periodic table but mostly it was wrong....he arranged them by the atomic number when it should have been by increasing the atomic number(and ya there's a difference)..the one that rearranged it was Henry Moseley.
It took many years to discover these elements. Hundreds of thousands worked and arranged the Periodic Table of Elements.The basic design of the periodic table was thought up by Dmitri Mendeleev. It was his idea to arrange the elements according to atomic mass (because this gave repeating patterns of properties). Later it was discovered that atomic charge was what was really important. Eventually the gaps Mendeleev left were filled in by the discovery of more elements, so while many scientist contributed to the modern periodic table Mendeleev is considered to have invented it.
Dmitri Mendeleev, a Russian scientist of the 19th century, is credited with organizing the periodic table the way we know it today. We have made minor changes to his arrangement over the years (and added a bunch more elements!) but the way he put it together still works.