Explain the reasons for the trends in Basic characters And also tell how Basicity varies in the periodic table. Please do mention the exception case if there is so?
Dear Student,
Basic character decreases on going from left to right across a period and increases down the group. This is because the electropositivity of the central atom decides whether the oxide or hydroxide will be acidic or basic. Greater the electropositivity of the central atom, greater will be the basic character. We know that electropositivity decreases n going from left to right across a period, therefore basic character also decreases and electropositivity increases on going from top to bottom in a group, so basicity increases on going top to bottom in a group.
Basic character decreases on going from left to right across a period and increases down the group. This is because the electropositivity of the central atom decides whether the oxide or hydroxide will be acidic or basic. Greater the electropositivity of the central atom, greater will be the basic character. We know that electropositivity decreases n going from left to right across a period, therefore basic character also decreases and electropositivity increases on going from top to bottom in a group, so basicity increases on going top to bottom in a group.