12. Describe how each of the following are related. a. Group number and number of valence electrons
for representative elements
b. Principal energy level of valence electrons and
period number

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?

Fossil fuels are organic compounds that are made from

How many neutrons does an element have if its atomic number is 50 and its mass number is 166