Question

10 main feature of modern periodic table

Answer 1

Modern Periodic Table :

• Modern periodic table is based on atomic numbers of the elements.
• The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
• The horizontal rows in the periodic table are called periods.
• The vertical columns in the periodic table are called groups.
• The long or extended form of periodic table consists of seven periods and eighteen groups.
• The elements in a period have same number of energy shells, i.e., same principal quantum number (n). These are numbered 1 to 7.
• In a group, the elements have similar valence shell electronic configuration, therefore, exhibit similar chemical properties.
• The elements can be classified into four blocks viz., s-, p-, d- and f-block depending on the type of atomic orbitals that are being filled with electrons.
• The elements of modern periodic table are broadly classified into : Metals, Non metals and Metalloids.
• Elements of s and p block are called as Representative elements.
• Elements of d block are called as Transition elements.
• Elements of f block are called as Inner transition elements.