Whats the formula and name for Ca 2+ and N3-

Two things that biomedical has invented or innvated

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?