Write a short note on the position of isotopes in the Mendeleev’s and the modern periodic table.
Important Questions on Periodic Classification of Elements
Write the scientific reason for the atomic radius goes on decreasing while going from left to right in a period.
Write the scientific reason for metallic character goes on decreasing while going from left to right in a period.
Write the scientific reason for atomic radius goes on increasing down a group.
Write the scientific reason for elements belonging to the same group has the same valency.
Write the scientific reason for the third period contains only eight elements even though the electron capacity of the third shell is .
Write the names from the description.
The period with electrons in the shells K, L and M.
Write the names from the description.
The group with valency zero.
Write the names from the description.
The family of nonmetals having valency one.
