Alpha particles. Alpha particles are made of 2 protons and 2 neutrons. This means that they have a charge of +2, and a mass of 4. (the mass is measured in atomic mass units, where each proton & neutron=1) We can write them as , or, because they're the same as a helium nucleus, . Alpha particles are relatively slow and heavy.
For more, visit TIME Health. 1  The average attention span for the notoriously ill-focused goldfish is nine seconds, but according to a new study from Microsoft Corp., people now generally lose concentration after eight seconds, highlighting the affects of an increasingly digitalized lifestyle on the brain.
How Long to Notice Muscle Gain? The time frame in which you can expect to notice muscle gain depends on several factors: your current fitness level, the intensity and consistency of your workouts and your body fat percentage. You may notice strength gains before you feel a change in muscle size, at which time you also should see visible results. According to the National Academy of Sports Medicine, those who are new to exercise can expect to notice muscle gain within four weeks of beginning a strength-training program.