Why is K2S the formula for Potassium Sulfide. Use the words : charge, cation, anion, and octet rule in your reasoning

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

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A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159