Extended periodic table
Elements 119 and 120
The first two elements of period 8 will be ununennium and unbinilium, elements 119 and 120. Their electron configurations should have the 8s orbital being filled.

Extended periodic table

Section Title: Elements 119 and 120
Table Section Text: The first two elements of period 8 will be ununennium and unbinilium, elements 119 and 120. Their electron configurations should have the 8s orbital being filled.

Property	119	120

Standard atomic weight	[322]	[325]

Group	1	2

Valence electron configuration	8s1	8s2

Stable oxidation states	1, 3	2, 4

First ionization energy	463 kJ/mol	580 kJ/mol

Metallic radius	260 pm	200 pm

Density	3 g/cm3	7 g/cm3

Melting point	0–30 °C (32–86 °F)	680 °C (1,300 °F)

Boiling point	630 °C (1,200 °F)	1,700 °C (3,100 °F)

Sentence(s)

The first ionization energy is 463 kJ/mol.

final_sentence: The first ionization energy is 463 kJ/mol.