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33. The atom of which an element in the ground state has two unpaired electrons in the 2p sub-level?
(4) carbon
34. What is the total number of occupied s orbitals in an atom of nickel in the ground state?
(2) 2
35. Which atom in the ground has only three electrons in the 3p sub-level?
(1) phosphorus
Notes:
Na (11) N (28)
1s(2) 2s(2) 2p(6) 3s(1) 1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 4s(2) 3d
excited state when it carries into the second group without filling it in
s=2 p=6 d=10 f=14
43. An atom in the excited state can have an electron configuration
(1) 1s(2) 2s(2)
(2) 1s(2) 2p(1) CORRECT
(3) 1s(2) 2s(2) 2p(5)
(4) 1s(2) 2s(2) 2p(6)
Average Atomic Mass
14. x=(.72)(84.49) + abundance in decimal times isotopic mass + abundance in decimal + isotopic mass(2)
Test:
Isotope
Average Atomic Mass
Electron Configuration
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