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.
Normal Attention Span by Age: Children ages 5-6 years old typically can attend to one activity that is of interest to them for around 10-15 minutes at a time and should generally be able to filter out small distractions occurring simultaneously in the environment.mall groups of children may be able to play together for 15 minutes or up to a 1/2 hour if they are engaged in novel, interesting play activities. Children ages 6-7 years may be able to sustain attention to one interesting or novel task for as long a 30 minutes.