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.
Green tea is much lower in caffeine than coffee, containing between 15-40 milligrams per eight-ounce cup. Black tea has an average of 50 milligrams of caffeine per cup. Both green and black tea will have higher levels, depending on how much tea is used and brewing time.