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.
Many people believe that green tea is caffeine-free naturally, but in reality, it does contain some caffeine. The precise amount of caffeine contained in green tea varies among different types of green tea. Various types of tea can contain as little as 15 mg of caffeine per cup to as much as 75 mg of caffeine per cup. Some types of Matcha green tea can contain even higher levels of caffeine. There are certain steps you can take to reduce the amount of caffeine in your green tea, including the following: Drink green teas that are not shade grown. Both Gyokuro and Matcha are shade-grown and have higher caffeine contents.