75, Atomic mass of arsenic, 6, Number of neutrons in a carbon atom, 7, Atomic number of nitrogen, 40, Atomic mass of calcium, 12, Number of neutrons in sodium, 50, Atomic number of tin, 197, Atomic mass of gold, 110, Number of neutrons in tungsten.

Scorebord

Visuele stijl

Opties

Template wisselen

Automatisch opgeslagen activiteit "" herstellen?