Lecture 1 : Periodic table - physical and chemical properties of elements
In a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table
The modern explanation of the pattern of the table is that the elements in a group have similar configurations of the outermost electron shells of their atoms: as most chemical properties are dominated by the orbital location of the outermost electron
In the periodic table of the elements, elements are arranged in a series of rows so that those with similar properties appear in vertical columns. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases