The various energy levels in an atom of magnesium ( 12

24 Mg)
have different numbers of electrons. Use the following numbers
to answer questions 68–70.
a. 1
b. 2
c. 3
d. 6
e. 8
D 68. number of electrons in the first energy level
D 69. number of electrons in the second energy level
D 70. number of electrons in the third energy level


Answers: 68. b, 69. e, 70. b

Biology & Microbiology

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