Question

position of boron in long term of periodic table​

Answer 1

Answer:

Atomic number -5

Atomic mass -10.81 g.mol -1

Electronegativity according to Pauling -2.0

Density -2.3 g.cm-3 at 20°C

Melting point -2076 °C

Boiling point -3927 °C

Vanderwaals radius -0.098 nm

Ionic radius -0.027 nm

Isotopes -2

Electronic shell -[ He ] 2s22p1

Energy of first ionisation :

800.5 kJ.mol -1

Energy of second ionisation:

2426.5 kJ.mol -1

Energy of third ionisation:

3658.7 kJ.mol -1

Discovered by :

Sir Humphry Davy and J.L Gay-Lussac in 1808