The size of the atom shrinks as the number of protons (atomic number) increases from left to right.Electronegativity, ionisation energy, electron affinity, atomic radius and melting point are a few periodic trends. If we analyse these trends, it becomes easy to predict the properties of elements on basis of the group or period they belong to. There are specific patterns in the physical and chemical properties of elements revealed in the periodic table, called trends. It states “ When we arrange elements in increasing order of atomic number, there is a periodic repetition of their physical and chemical properties.“ He revised Mendeleev’s periodic table and proposed the modern one. Henry Mosely proposed the modern periodic law. Press the buttons to know about the characteristics of each element: For a more detailed understanding, let us study the first 20 elements of the periodic table. Hence, pink denotes metals, green for non-metals, orange for metalloids and yellow for noble gases. This is done to denote the type of element. The modern periodic table is colour coded. This makes it easier to remember.īased on the physical and chemical properties, the elements are divided into metals, non-metals, metalloids and noble gases. However, the new version, has groups named 1 to 18. The old scheme uses Roman numerals to denote the groups. The modern periodic table that Moseley designed has 118 elements. He proposed that the chemical properties of elements depend on atomic number and not on the atomic mass of the elements. So, Moseley analysed and re-arranged the elements in order of increasing atomic number instead of atomic mass.

The isotopes do not fit in Mendeleev’s periodic table. Mendeleev did a great job arranging the elements into a table but Moseley found some inconsistencies in his periodic table.įor instance, he was unable to locate hydrogen in the periodic table. In 1913, an English Physicist named Henry Moseley revised Mendeleev’s periodic table. Moseley’s Periodic Table: The modern periodic table

Periodic table color coded