F
Fluorine · element 9
Diatomic Nonmetal · Gas at room temperature
Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive:almost all other elements, including some noble gases, form compounds with fluorine.
Key facts
Atomic mass
18.9984031636 u
how heavy one atom is
Phase (room temp.)
Gas
Density
1.696 g/L
how tightly packed it is
Melting point
53.48 K (-220 °C)
when solid turns to liquid
Boiling point
85.03 K (-188 °C)
when liquid turns to gas
Period
2
its row in the periodic table
Group
17
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
3.98
how strongly it pulls electrons
Electron configuration
[He] 2s2 2p5
where its electrons live
Shells
2 · 7
electrons in each layer, inside to out
Discovered by
André-Marie Ampère
who found it
Named by
Humphry Davy
who gave it its name
Source: Wikipedia