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 child daydreaming in school. Psychologists vary on what they believe the âaverageâ attention span of a child may be. Some assert that the childâs age plus two minutes is the average.That means most kindergarteners (most are five years old) have a seven-minute attention span.Others insist that the age of the child multiplied by three to five minutes is the average.These folks think that a six-year-old, or average first grader, can concentrate for 18 to 30 minutes. Few of these people have taught first grade.thers insist that the age of the child multiplied by three to five minutes is the average. These folks think that a six-year-old, or average first grader, can concentrate for 18 to 30 minutes. Few of these people have taught first grade.