Si1428andS1429are___________________.
Si1428andS1429are isotopes.
Isotopes: The isotopes of an element have the same atomic number but different atomic masses. The difference in their masses is due to the presence of a different number of neutrons.
14Si28 and 14Si29 are called _______ .
34 g of ammonia is decomposed to _________ g of nitrogen and _____ g of hydrogen, _____ is the ratio of hydrogen to nitrogen by mass. The options in blanks are respectively: