Hello! Im in a unit exam right now and i really need help! Who ever answers this gets brainliest

What element breaks down into yttrium-90?

Ihat will happen if i added baking soda to vinegar

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.