Element 85

Astatine (At)

85

At

astatine

Nonmetal · p block · group 17, period 6

Electron configuration: $[\mathrm{Xe}]\,6s^{2}\,4f^{14}\,5d^{10}\,6p^{5}$
Unpaired electrons: 1 (paramagnetic)
Valence electrons: 7
Molar mass: 210 g/mol
Electronegativity: 2.2
Atomic radius: 150 pm
First ionization energy: 899 kJ/mol
Electron affinity: 233 kJ/mol released

Practice

Practice astatine

No course questions are about astatine specifically, but these lessons cover what you need.

Where it comes up in the course