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john newlands
Groups are arranged as columns in the periodic table; the contained elements have similar properties.
Mendeleev was the scientist who first devised the periodic table of the elements. The pattern he found was that elements have periodic, or repeating series of properties. If you write down the elements in a series according to increasing atomic number, there is a repeating pattern; first metals, then nonmetals, then noble gases, then back to metals. This pattern helps us to understand why elements have the particular chemical properties that they have. It is fundamental to the science of chemistry.
He had to sing a song about the elements!
In 1869, a Russian scientist named Dmitri Mendeleev arranged the elements in a table according to their atomic mass, this was the first periodic table. However, a few elements didn't fit the pattern in Mendeleev's table, so a new table had to be made, and that table is today's periodic table which is arranged by atomic number, and not atomic mass.
john newlands
Groups are arranged as columns in the periodic table; the contained elements have similar properties.
his tables contained gaps that elements with particular properties should fill.
his tables contained gaps that elements with particular properties should fill.
they discovers a repeating pattern of properties
Mendeleev was the scientist who first devised the periodic table of the elements. The pattern he found was that elements have periodic, or repeating series of properties. If you write down the elements in a series according to increasing atomic number, there is a repeating pattern; first metals, then nonmetals, then noble gases, then back to metals. This pattern helps us to understand why elements have the particular chemical properties that they have. It is fundamental to the science of chemistry.
Dmitri Mendeleev was the first scientist to create a periodic table of the elements similar to the one we use today. This table showed that when the elements were ordered by increasing atomic weight, a pattern appeared where properties of the elements repeated periodically.
his tables contained gaps that elements with particular properties should fill.
in 1914 Henry mosely stated the modern periodic law. He said that when the elements are in order of increasing atomic number (number of protons) they show a periodicity or repeating pattern of properties.
by putting your buttox on it
Meneleev arranged the elements
He organised them by atomic mass, but in one instance swapped one round, to make the "pattern" fit.The pattern was that when listed by atomic mass, he noticed that when the elements where arranged into rows of 8, the columns they formed contained elements which all had similar physical and chemical properties.So in answer to your question : by atomic mass and physical/chemical properties.