Which type of measurement is used least often by scientists?

What type of reaction is illustrated? 2c12o5 = 2cl2 + 502

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?

Which element would mostly likely have an electron affinity measuring closest to zero