Chem 210 Final exam study guide, Questions and Correct Answers, 2026/2027 With complete solution.

What is ground state electron configuration of Co?
[Ar]3d^9
[Ar]4s^1 3d^8
[Ar]4s^2 3d^7
[Ar]4s^2 4p^6 4d^1
[Ar]4s^2 3d^7
molybdenum has an anomalous electron configuration. using the shorthand
notation for electron configurations, write the electron configuration
A) [kr]5s 4d^6
B) [kr]5s 4d^0 5p^6
C) [kr]5s^1 4d^5
D) [kr]5s^2 4d^4
C) [kr]5s^1 4d^5
the symbol [Kr] represents
a) 4s^2 4p^6
b) 1s^2 2s^2 2p^6 3s^6 4s^2 4p^6
c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6
D)1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6 4d^10
c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6
What is the wavelength of UV light in the balmer series when m=2 and n=7?
a) 0.00252 nm
b) 397 nm
c)337 nm
d)0.00297 nm
b) 397 nm
How many electrons can a single orbital hold?
A) 2n
B) 2
C) 2l+1
D)8
B) 2
What are the possible values of I and m1 for an electron in a 5d orbitial?
A) I=0 and mI=0
B) I=3 and MI=-2,-1,0,+1, or +2
c) I=1 and MI=-1,0,+1
D) I=2 and MI=-2,-1,0,+1, +2
D) I=2 and MI=-2,-1,0,+1, +2
What is the the de Broglie wavelength of an electron (m=9.11e-31 kg) moving at a
velocity of 3.0e7m/s?
a) 3.9e-12
b)2.4e-11