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.
Depending on your age, it should take you between 15 an 20 minutes. When I am in the mall, I could probably get it up to 12 minutes because I want to get the hell out of there : ) If you are walking in love you may never get to that mile marker. Too busy gazing in to each others eyes. Doesn't matter how fast.