SAMPLE PROBLEM 8.2
Determining Electron Configuration
PLAN:
SOLUTION:
(a) potassium (K: Z = 19)
(b) molybdenum (Mo: Z = 42)
(c) lead (Pb: Z = 82)
Use the atomic number for the number of electrons and the periodic table for the order of filling of the electron orbitals. Condensed configurations consist of the preceding noble gas plus the outer electrons.
(a) for K (Z = 19)
1s22s22p63s23p64s1
[Ar] 4s1
K has 18 inner electrons.
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