TEST BANK FOR ORGANIC CHEMISTRY 9TH
EDITION LEROY WADE AND JAN SIMEK | 26
CHAPTERS NEW 2026-2027 UPDATE WITH ALL
COMPREHENSIVE REAL EXAM QUESTIONS AND A
DETAILED BREAKDOWN OF ALL CORRECT
VERIFIED ANSWERS EXAM PLUS CERTIFIED
RATIONALES | COMPLETE TEST SOLUTION | PASSED
& REWARDED WITH DISTINCTION FOR ORIGINALLY
GRADE A+ BRAND NEW!!!
Chapter 1: Structure and Bonding
1. What is the ground-state electron configuration of
boron (atomic number 5)?
A) 1s²2s³
B) 1s²2s²2p¹
C) 1s²2p³
D) 2s²2p³
Rationale: Boron has 5 electrons. After filling the
1s and 2s orbitals (4 electrons), the fifth electron
occupies a 2p orbital.
,2. How many distinct p orbitals exist in the second
electron shell (n = 2)?
A) 2
B) 3
C) 4
D) 5
Rationale: The second shell contains one 2s orbital
and three 2p orbitals (px, py, pz).
3. Which principle states that each orbital can hold
a maximum of two electrons?
A) Aufbau principle
B) Pauli exclusion principle
C) Hund's rule
D) Le Chatelier's principle
Rationale: The Pauli exclusion principle states that
no two electrons in an atom can have the same
four quantum numbers.
,4. Atoms with the same number of protons but
different numbers of neutrons are called:
A) ions
B) isomers
C) isotopes
D) allotropes
Rationale: Isotopes differ only in neutron number,
affecting mass but not chemical identity.
5. Which orbital has spherical symmetry?
A) p
B) s
C) d
D) f
Rationale: The s orbital is spherically symmetric
around the nucleus.
6. How many valence electrons does an oxygen atom
have?
A) 4
, B) 5
C) 6
D) 8
Rationale: Oxygen is in group 16, so it has 6
valence electrons (2s²2p⁴).
7. What is the formal charge on nitrogen in the
ammonium ion (NH₄⁺)?
A) 0
B) +1
C) -1
D) +2
Rationale: Nitrogen has 5 valence electrons; in
NH₄⁺ it has 4 bonds and no lone pairs. Formal
charge = 5 - (0 + 4) = +1.
8. Which element in the second row has six valence
electrons and a valence of two?
A) Carbon
B) Nitrogen
EDITION LEROY WADE AND JAN SIMEK | 26
CHAPTERS NEW 2026-2027 UPDATE WITH ALL
COMPREHENSIVE REAL EXAM QUESTIONS AND A
DETAILED BREAKDOWN OF ALL CORRECT
VERIFIED ANSWERS EXAM PLUS CERTIFIED
RATIONALES | COMPLETE TEST SOLUTION | PASSED
& REWARDED WITH DISTINCTION FOR ORIGINALLY
GRADE A+ BRAND NEW!!!
Chapter 1: Structure and Bonding
1. What is the ground-state electron configuration of
boron (atomic number 5)?
A) 1s²2s³
B) 1s²2s²2p¹
C) 1s²2p³
D) 2s²2p³
Rationale: Boron has 5 electrons. After filling the
1s and 2s orbitals (4 electrons), the fifth electron
occupies a 2p orbital.
,2. How many distinct p orbitals exist in the second
electron shell (n = 2)?
A) 2
B) 3
C) 4
D) 5
Rationale: The second shell contains one 2s orbital
and three 2p orbitals (px, py, pz).
3. Which principle states that each orbital can hold
a maximum of two electrons?
A) Aufbau principle
B) Pauli exclusion principle
C) Hund's rule
D) Le Chatelier's principle
Rationale: The Pauli exclusion principle states that
no two electrons in an atom can have the same
four quantum numbers.
,4. Atoms with the same number of protons but
different numbers of neutrons are called:
A) ions
B) isomers
C) isotopes
D) allotropes
Rationale: Isotopes differ only in neutron number,
affecting mass but not chemical identity.
5. Which orbital has spherical symmetry?
A) p
B) s
C) d
D) f
Rationale: The s orbital is spherically symmetric
around the nucleus.
6. How many valence electrons does an oxygen atom
have?
A) 4
, B) 5
C) 6
D) 8
Rationale: Oxygen is in group 16, so it has 6
valence electrons (2s²2p⁴).
7. What is the formal charge on nitrogen in the
ammonium ion (NH₄⁺)?
A) 0
B) +1
C) -1
D) +2
Rationale: Nitrogen has 5 valence electrons; in
NH₄⁺ it has 4 bonds and no lone pairs. Formal
charge = 5 - (0 + 4) = +1.
8. Which element in the second row has six valence
electrons and a valence of two?
A) Carbon
B) Nitrogen
