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.
Making? the length of circle time match your groupâs attention span. In the beginning of the year, circle time may need to only be 5 minutes long and then expand to no more than 10 minutes for 2 year olds and 15 minutes for 3 year olds. Why? Because you may lose the attention of even the best-behaved and brightest young children after this amount of time.