As
Arsenic · element 33
Metalloid · Solid at room temperature
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
Key facts
Atomic mass
74.9215956 u
how heavy one atom is
Phase (room temp.)
Solid
Density
5.727 g/cm³
how tightly packed it is
Period
4
its row in the periodic table
Group
15
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
2.18
how strongly it pulls electrons
Electron configuration
[Ar] 3d10 4s2 4p3
where its electrons live
Shells
2 · 8 · 18 · 5
electrons in each layer, inside to out
Discovered by
Bronze Age
who found it
Appearance
metallic grey
what it looks like
Source: Wikipedia