Explain why the general trend exists for elements getting smaller as you move across a period on the periodic table.
Explain the importance of the VSEPR Theory.
As you move across the periodic table, the number of electrons that each atom has increases. At the same time the number of protons and neutrons also increases. This is also true as you go down a group in the periodic table. But the key difference is that while electrons are added in different valence shells as you go down a group, the electrons are added to the same valence shell as you go across a period. This means that across a ...
The reason for trends in radii is explained. Main features of VSEPR theory are also given.