Issued as a cumulative or non-cumulative L/C, the former allows for unused credit amounts to rollover into subsequent periods while the latter maintains a fixed amount of credit available each period.
average atomic mass of magnesium is 24.3 g/mole so 24.3 X 1.56 X1021 / 6.02 X1023 = .063 grams.
Magnesium. The number of protons in an element is always the same as the atomic number, which is 12 in this case. In a neutral atom (no charge), the number of electrons equals the number of protons, so it will be 12 electrons also. However, the number of neutrons will vary depending on the isotope (atoms of the same element with different numbers of neutrons). There are three isotopes of Magnesium, 24Mg, 25Mg, 26Mg, having 12, 13, and 14 neutrons respectively (12 is the most abundant).