An alpha particle
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Calcium-42 is a radioactive isotope that can be used in medical research, particularly in studies related to bone formation and calcium metabolism. It can also be used in geology to trace calcium movements in natural systems.
42 20 Ca
The only naturally occurring isotope of As (atomnumber 33) is As-75 (76 and 77 have decay half-time of several houres)This As-75 has 33 protons, 33 electrons and (75-33 =) 42 neutrons
42 km = 42 000 mTO convert from km to m, multiply by 1000.
42 millimeters is equivalent to approximately 1.65354 inches.