protons-34 neutrons-45 Electrons-34
The element selenium is a solid
Its a non-metal
It was discovered by Johan Gottlieb Guhn and Jons Jacob Berzelius
it was discorvered in 1817
It appears in some foods, can also be used in medicine
Physical properties-solid, density, melting point 221 degrees c
Chemical properties-it rust easy, it burns easy, easily combines with hydrogen fluorine and choline.
It was discovered in sweeden.