8 Strange Properties of Boron ( Group 13 element )

boron properties

Boron is the first element of group 13 and non metallic. It is extremely hard and black coloured solid having high melting point.

It has small size and higher electronegativity, higher ionisation enthalpy. It is a non metal, black coloured solid.It is hard refractory solid of 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

  1. Boron is a non-metal while members of group 13 are metals such as Aluminium. Gallium. Indium and Thallium.
  2. Boron has the highest melting and boiling point in group 13.
ElementsMelting pointBoiling 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)

ElementsElectronegativitiy
Beryllium (B) 2.04
Aluminium (Al)1.61
Gallium (Ga)1.81
Indium (In)1.78
Thallium (Tl)1.62

Data Source https://www.webelements.com/

4. Due to high electronegativity, boron forms only covalent compounds but remaining members can form covalent as well ionic compounds.

5. Oxides of the Boron are weakly acidic in nature but aluminium has oxides which are amphoteric in nature. Gallium, Indium, and Thallium have weakly acidic oxides.

Read also 11 Strange Properties of Beryllium

6. Oxides of the Boron are weakly acidic in nature but aluminium has hydroxides which are amphoteric in nature. Gallium, Indium, and Thallium have weakly acidic hydroxides.

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.

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