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Answered 2011-11-20 20:44:28

Dmitri Mendeleev in 1869; but because the history of this discovery is more complicate see the link below.

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The first periodic table was put in order of atomic mass, not atomic number.

The Russian chemist Dmitri Mendeleev was the first scientist to make a periodic table similar to the one used today.

Dmitri Mendeleev is credited with the first periodic table

Dimitri Mendeleev. But it didnt look like the periodic table we use today.

The Periodic Table was put together by a Russian college professer named Dmitri Mendeleev. He did it to help his students remember the elements that were on the table at the time.

ti was put together by smart people who like to do science and are big geeks

wwhy was the periodic table put together? The Periodic Table is very helpful to chemists, physicists, and other scientists because it helps to categorize the behavior of the elements in the table. For example, you can expect elements with the same number of protons in the nucleus of an atom to behave in similar ways. Thus, elements with the same number of protons are kept in the same column of the table. Nice!

the periodic table is grouped according to similarities. when Mendeleev grouped his first periodic table they followed a pattern. any elements that contained similarities they were all put into the same column.

Because they are not elements. They are combinations of different elements put together.

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.

At the time the periodic table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.When the periodic table was first devised, there were lots of elements that had not been discovered yet.

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.

elements are found on the periodic table compounds are two or more elements put together to make a compound

The Periodic table of elements was created by a Russian scientist named Dmitry Ivanovich Mendeleev. When he created it in 1869 not a lot of elements had been discovered. He put the table together using the elements atomic number. Hydrogen for example is first on the periodic table because it's atomic number is one. When he completed it there were a lot of gaps. What Dmitry did was he actually predicted the existence of other elements where the gaps were on the periodic table. A lot of the elements have been found but a few are still 'unobserved'. The periodic table is set out using it's atomic number. There is also the AMU which is the atomic mass unit but it does not have much to do with the set out of the periodic table.

The first periodic table was a handwritten table by Mendeleev. It had groups horizontally across the top and periods down the left hand side. The elements were all put into certain groups with only their chemicals symbols and atomic numbers depicted.

It is meant some of the elements in the periodic table put into a group! The vertical columns in the periodic table are called groups

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.)

when the periodic table was first made, it only had the basic elements eg. hydrogen, oxygen, etc. Now with scientist finding more elements and creating them eg. americum, einstienium or europium, there are more elements than ever before. An element only has to exist for 2 seconds before they put it on the periodic table.

The elements of the periodic table were put in a specific order based off of the increasing atomic mass. The periodic table we use today has the elements arranged according to their increasing atomic numbers.

They are not actually detached. They are only put at the bottom to condense the periodic table more reasonably. If you look at a picture of the extended periodic table you would see that they are right in there with the transition metals

Mendeleev first created the periodic table in 1869. He thought that the elements must be organised in some way, that we would be able to use for experiments. And he first thought of the periodic table. He tried and tried but could not get them all to fit. He stayed up for hours, until finally giving up late at night. But when he went to bed, he did not know that just hours later, he would make one of the biggest discoveries yet... He went to bed and dreamed about the periodic table. Then, he dreamt of one only possible way too make the elements fit together. He suddenly woke up, and put all his cards in place, and the periodic table was made.

Br and Cl possess same properties. So he grouped them together.

They are below the table just as a convinence, you can put them into the periodic table if you want to, but it just makes the table long