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.
Â· just now. Report Abuse. The average attention span of a person is 2-5 minutes times their age, so a 5-year-old would have an average attention span of 15-25 minutes. Elementary education often seeks to extend or develop attention span in children.f you want a measure, then I don't know how one can expect to get an average of something like attention span when, say a person can sit and pay attention for 2 or 3 hours at a movie, but will pay 1/2 a seconds time paying attention to a Hot Pocket. If I say the average human attention span is 49 minutes..