An element cant be the same. That is why they are called elements, but i would have to say wind and air.
Molecules and elements are not the same thing. There are many molecules in elements but not elements inside of molecules.
No two elements have the same properties.
No, elements in the same column are in the same family.
elements are in the same group since they react similarly to other elements in that group.
The elements in a group do not have the same number of shells, however, the elements in a horizontal row do have the same number of shells.
All elements in the same group have the same number of valence electrons.
Yes they are.
All elements in the same group have the same number of valence electrons.
Elements in the same group have the same number of valence electrons.
Elements in the same group have the same number of valence electrons and hence have similar properties.
Same elements of group have same valency. They possess same chemical behaviour.
Elements that have similar chemical properties occupy the same group on the Periodic Table.