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.
A pair of studies have found the 100-character mark to be the sweet spot for tweet length. Track Social studied 100 major brands (Oreo, Zappos, ESPN, etc.) for a 30-day period in the fall of 2012. Buddy Media studied 320 Twitter handles from major brands for two-and-a-half months at the beginning of 2012.