increasing atomic number and repeating properties
it is based on the fact that properties of elements are periodic function of their atomic masses
atomic number
The weight of the nucleus and protons it contains. They are also placed in type order, so that similar property elements are together
By arranging elements with increasing proton (atomic) numbers.
A Periodic table The Periodic Table of the Elements.
Mendeleev developed the periodic table of elements by arranging the elements in order of increasing atomic mass in 1869. He discovered that elements with similar properties occurred in a periodic pattern. He was able to predict the properties of elements that were missing at the time because of this pattern. In 1914, Moseley contributed to the periodic table by reorganizing the elements according to atomic number.
Because the properties of the elements change in a periodic fashion. In the early versions, when fewer elements were known, the chemically similar elements were thought to occur every eight positions.
elements
The weight of the nucleus and protons it contains. They are also placed in type order, so that similar property elements are together
Dmitri Ivanovich Mendeleev.
By arranging elements with increasing proton (atomic) numbers.
he drew up a table that grouped elements according to their atomic weights, his table became the basis for the periodic table of elements used today.
Henry G. J. Moseley
A Periodic table The Periodic Table of the Elements.
atomic number
The properties of elements are found to be periodic when arranged according to atomic number. Hence atomic number is considered as base for arranging the elements.
Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them.
Mendeleev developed the periodic table of elements by arranging the elements in order of increasing atomic mass in 1869. He discovered that elements with similar properties occurred in a periodic pattern. He was able to predict the properties of elements that were missing at the time because of this pattern. In 1914, Moseley contributed to the periodic table by reorganizing the elements according to atomic number.
It is called the Periodic Table of Elements.