E-STAR - Student

Mendeleev’s periodic law states that the properties of elements are periodic functions of their atomic masses.
Group is the vertical column of elements.
Period is the horizontal row of elements.
The modern periodic law states that the properties of elements are periodic functions of their atomic numbers.
The Periodic Table is the arrangement of the elements into periods and groups.
The Periodic Table consists of 8 main groups and 7 periods.
The electronic configurations of elements helps to determine the group and period number of an element.
All elements in the same group have the same number of valence electrons.
The number of valence electrons determines the group number of an element in main group elements.
The number of shells of an atom equals the period number to which the element belongs.
Elements in the same group have similar chemical properties because they have the same valence electronic configuration (valence electrons).
Elements are classified as metals, non-metals and metalloids.
Metals are found on the left side while non-metals are found on the right side of the Periodic Table.
Certain atomic properties vary periodically, when atoms are considered in terms of increasing atomic number. The properties and trends considered in this unit are those of atomic radius, ionic radius, ionization energy and electron affinity. Values of these atomic properties strongly influence physical and chemical properties of the elements.