Pattern - General Trends in Properties of Group 13 elements
There are many trends in the periodic table. Trends such as melting point, boiling point, ionisation enthalpy and electronegativity are very important from an exam point of view.
Boiling point of group 13 generally decreases down the group whereas melting point first decreases from B to Ga and then increases from Ga to Tl. Conventionally, ionisation enthalpy should decrease down the group but certain discontinuities are observed in ionisation enthalpies between Al and Ga & In and Tl. Electronegativity first decreases from B to Al and then increases marginally.
How to approach
The questions are mostly based on identifying the trends in melting point, boiling point, ionisation enthalpy, electronegativity, etc. These questions can be solved if we have a clear idea about the concept behind all the trends and we should also be aware of the exceptions that exist in some of these trends.
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