Vocabulary alpha particle atomic number atomic weight beta particle element isotope isotopic abundance mass number neutron nuclide nuclide symbol proton radioactivity Before the discovery of radioactivity, all atoms of a particular element were assumed to be identical.
Side effects. Green coffee seems to cause few side effects. The caffeine in green coffee -- just like the caffeine in brewed coffee -- can cause symptoms that include: 1  Headache. 2  Upset stomach. 3  Anxiety.
Although green tea typically has less caffeine than black tea, this is not always the case. Caffeine content may vary depending on the plant varietal, processing, and brewing methods. According to the Mayo Clinic, the caffeine content of green tea ranges from 24-40 mg per cup and black tea ranges from 14-61 mg per cup.