Boron is the first element of group 13 and non metallic. It is extremely hard and black coloured solid having high melting point.
It forms allotropes such as crystalline boron, amorphous boron.
Why boron shows strange properties
- Due to high electronegativity
- Small atomic size (180 pm)
- The absence of d orbital
Strange Properties of Boron
- Boron is a non-metal while members of group 13 are metals such as Aluminium. Gallium. Indium and Thallium.
- Boron has the highest melting and boiling point in group 13.
|Elements||Melting point||Boiling point|
|Boron||2,076 °C||3,927 °C|
|Aluminium||660.3 °C||2,470 °C|
|Gallium||29.76 °C||2,400 °C|
|Indium||156.6 °C||2,072 °C|
|Thallium||304 °C||1,473 °C|
3. Boron has the high electronegativity and high ionisation enthalpy (804 KJ/mole)
Data Source https://www.webelements.com/
4. Due to high electronegativity, boron forms only covalent compounds but remaining members can form covalent as
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5. Oxides of the Boron are weakly acidic in nature but
6. Oxides of the Boron are weakly acidic in nature but
7. Boron hydride is stable but hydrides of other elements are less stable because as we go down the group atomic size increases and hence bond between metal and hydrogen becomes weaker.
8. Only boron reacts with active metals like magnesium to form borides.