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 contains a significantly lower quantity of caffeine than coffee, colas, and other teas, such as black or oolong tea. The amount of caffeine in green tea depends on the variety of tea plant, how it is produced, and the way the tea is prepared. Steeping time, the temperature of the water, and the number of times a batch of tea leaves has been used changes the caffeine content. On average, a cup of green tea contains 3â30 mg of caffeine. Black tea has 30â60 mg of caffeine. A can of cola contains about 34 mg of caffeine.