Which of the following is true about an atom of iron and an atom of copper? They have different masses.
Both have the same properties.
They have an equal number of protons.
Both have different types of sub-atomic particles.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.