CHEM 210 TEST 4 EXAM REVIEW SOLVED QUESTIONS COMPLETE ANSWERS GRADED A
PLUS
CHEM 210 TEST 4 Practice Solution 2026/2027
Questions and Answers Verified Solutions Latest
Update
Question:
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.
Answer:
C) [kr]5s^1 4d^5
Question:
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.
Answer:
c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6
Question:
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.
Answer:
b) 397 nm
Question:
How many electrons can a single orbital hold? A) 2n B) 2 C) 2l+1 D)8.
Answer:
B) 2
,Question:
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.
Answer:
D) I=2 and MI=-2,-1,0,+1, +2
Question:
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 c)3.3e-8 d)1.1e-4.
Answer:
b)2.4e-11
Question:
What is the frequency of a helium-neon laser light with a wave of 632.8 nm? a) 4.47e14 s-1
b)4.47e5 s-1 c)2.11e-15 s-1 d)1.58e-15 s-1.
Answer:
a) 4.47e14 s-1
Question:
What is the correct nuclear symbol for the unknown product "X" in the nuclear equation shown
below? A)234 TH B) 226 Ra C) 234 U D) 242 Pu E) 234 Pu 94.
Answer:
A)234 TH
Question:
The alpha particle is A)1 1 H B)2 1 H C)3 1 H D)4 2 He.
Answer:
, D)4 2 He
Question:
15. An element has two naturally occurring isotopes. One has an abundance of 37.40% and an
isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956
amu. What is the atomic weight of the element? A) 185.7 amu B) 186.0 amu C) 186.2 amu D) 187.0
amu.
Answer:
C) 186.2 amu
Question:
What is the chemical symbol for an atom that has 29 protons and 36 neutrons? A) Cu B)Kr C)N
D)Tb.
Answer:
A) Cu
Question:
How many protons (p) and neutrons (n) are in an atoms of 90Sr A) 38 p, 52 n B) 38 p, 90 n C) 52 p,
38 n D) 90 p, 38 n.
Answer:
A) 38 p, 52 n
Question:
The observation that hydrogen and oxygen can react to form two compounds with different
chemical and physical properties, one having an O:H mass ratio = 8:1 and the other having an O:H
mass ratio = 16:1 is consistent with the law of A)definite proportions B) energy conservation C)
mass conservation D)multiple proportions.
Answer:
multiple proportions
PLUS
CHEM 210 TEST 4 Practice Solution 2026/2027
Questions and Answers Verified Solutions Latest
Update
Question:
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.
Answer:
C) [kr]5s^1 4d^5
Question:
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.
Answer:
c) 1s^2 2s^2 2p^6 3s^6 4s^2 3d^10 4p^6
Question:
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.
Answer:
b) 397 nm
Question:
How many electrons can a single orbital hold? A) 2n B) 2 C) 2l+1 D)8.
Answer:
B) 2
,Question:
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.
Answer:
D) I=2 and MI=-2,-1,0,+1, +2
Question:
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 c)3.3e-8 d)1.1e-4.
Answer:
b)2.4e-11
Question:
What is the frequency of a helium-neon laser light with a wave of 632.8 nm? a) 4.47e14 s-1
b)4.47e5 s-1 c)2.11e-15 s-1 d)1.58e-15 s-1.
Answer:
a) 4.47e14 s-1
Question:
What is the correct nuclear symbol for the unknown product "X" in the nuclear equation shown
below? A)234 TH B) 226 Ra C) 234 U D) 242 Pu E) 234 Pu 94.
Answer:
A)234 TH
Question:
The alpha particle is A)1 1 H B)2 1 H C)3 1 H D)4 2 He.
Answer:
, D)4 2 He
Question:
15. An element has two naturally occurring isotopes. One has an abundance of 37.40% and an
isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956
amu. What is the atomic weight of the element? A) 185.7 amu B) 186.0 amu C) 186.2 amu D) 187.0
amu.
Answer:
C) 186.2 amu
Question:
What is the chemical symbol for an atom that has 29 protons and 36 neutrons? A) Cu B)Kr C)N
D)Tb.
Answer:
A) Cu
Question:
How many protons (p) and neutrons (n) are in an atoms of 90Sr A) 38 p, 52 n B) 38 p, 90 n C) 52 p,
38 n D) 90 p, 38 n.
Answer:
A) 38 p, 52 n
Question:
The observation that hydrogen and oxygen can react to form two compounds with different
chemical and physical properties, one having an O:H mass ratio = 8:1 and the other having an O:H
mass ratio = 16:1 is consistent with the law of A)definite proportions B) energy conservation C)
mass conservation D)multiple proportions.
Answer:
multiple proportions
