How many electrons are in the third principal energy level (n=3) of one atom of Fe 2, 18, 8, 14, or none?
Answer:
the atomic number of Fe is 26, so its electron configuration is:
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6 or [Ar]4s^2 3d^6.
Number of electrons on n = 3 is (2+6+6) = 14
12
the answer is 6, assuming you're not referring to any specific isotope.
Well, let us find out. Atomic number = 26, 26 electrons for non-ionic Fe; 1s2 2s2 2p6 3s2 3p6 4s2 3d6
The answer is 14. The 4s energy level is lower energy than 3d so it fills up first.
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