Whats is the difference between a strong electrolyte and a weak electrolyte

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

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.

What shape would a molecule with two bound groups and two lone pairs have?