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,

Leaderboard

Visual style

Options

Switch template

Continue editing: ?