The first idea of arranging the elements in periodic table is given by John Newland, he thought that arranging element in order of increasing their atomic masses elements with the same characteristic will be in one group.
He arrange the elements in columns according to the law, he called the law of octaves
In his periodic table John newlands grouped together an elements which had very different characteristic example of oxygen was placed in the same group with iron and sulphur
DMITRI MENDELEEV PERIODIC TABLE
Another scientific a Russian chemist Dmitri Mendeleev later develop the new ideas and convince the other promise to use them.
Natalie summarised his periodic law that state that
"the properties of element are periodic function of their relative atomic masses"
✓He said vertical columns of elements are called group
✓horizontal rows or columns are called period
✓Mendeleev left gaps in his table predicting that the existing elements yet-to-be-discovered
This is a table of element arranged systematically according to the increasing atomic numbers.
in modern periodic table elements arranged in a table in order of increasing atomic number.
The modern periodic law states that:
"The properties of element are periodic functions of their atomic numbers"
The tendencies of elements with the same characteristic to be placed in one group by arranging them in the periodic table in order of increasing the atomic number it is called periodicity
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