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NCERT Chemistry class 12- What is Group 16 Elements

NCERT Chemistry class 12- Group 16 Elements 

NCERT Chemistry class 12 - Group 16 elements are known as the oxygen family or chalcogens. They include elements oxygen (O), sulphur (S), selenium (Se), tellurium (Te), and the radioactive element polonium (Po).

ATOMIC AND PHYSICAL PROPERTIES
Atomic and Ionic Radii: The atomic and ionic radius of the group 16 elements increases as one move from oxygen to polonium (top to bottom).As the number of shells increases on going down the group, atomic and ionic radii increase from top to bottom in the group. However, the size of oxygen atoms is exceptionally small.
Ionization Enthalpy: Ionisation enthalpy of the elements decrease down the group, as there is an increase in the size of the atoms down the group. However, the element of group 16 has lower ionization enthalpy values as compared to those of group 15 in the corresponding periods. This is due to the fact that group 15 element have extra stable half-filled p orbitals electronic configurations.
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