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строительное дело
тёрка (гладилка) из магниевого сплава
Magnesium (12Mg) naturally occurs in three stable isotopes: 24
Mg, 25
Mg, and 26
Mg. There are 19 radioisotopes that have been discovered, ranging from 18
Mg to 40
Mg (with the exception of 39
Mg). The longest-lived radioisotope is 28
Mg with a half-life of 20.915(9) h. The lighter isotopes mostly decay to isotopes of sodium while the heavier isotopes decay to isotopes of aluminium. The shortest-lived is proton-unbound 19
Mg with a half-life of 5(3) picoseconds, though the half-life of similarly unbound 18
Mg has not been measured.