A. change in the kinetic energy of a moving atom
B. instability of the nucleons
C. excitation of an electron in the atom
D. transition of an electron from a higher to a lower energy level
Correct Answer: Option D
D. transition of an electron from a higher to a lower energy level
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![What is the mass of 6.02 x 10^24 atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10^23 atoms mol-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "What is the mass of 6.02 x 10^24 atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10^23 atoms mol-1]")
