What is the atmosphere?
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Ответ:
An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
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Ответ:
Magnesium has three naturally occurring isotopes (Mg-24, Mg-25, and Mg-26). Masses and natural abundances for two isotopes are listed here. Isotope Mass (amu) Abundance (%) Mg-24 23.9850 79 Mg-25 24.9858 10 Mg-26 ? ? Find the natural abundance and atomic mass of Mg-26 . Express your answer using two significant figures. thank you
its 24 and 79