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WorksheetsAtomic Structure and Electron Configuration
Total questions: 20
Worksheet time: 18mins
Which scientist is known for his, "Plum Pudding" model of an atom?
JJ Thomson
John Dalton
Ernest Rutherford
Erwin Schrodinger
Which of the following is TRUE about Dalton's atomic theory?
Each element contains a set of protons, neutrons, and electrons.
All atoms, regardless of whatever element, are identical.
Atoms can be created and destroyed.
Each element is composed of extremely small particles called, "atoms".
Who gave the idea that the atom is mostly made up of empty space?
Ernest Rutherford
JJ Thomson
Erwin Schrodinger
Neils Bohr
Which scientist proposed the model of the atom in which the electrons are orbiting at different levels?
Ernest Rutherford
JJ Thomson
Erwin Schrodinger
Neils Bohr
To which one of the following energy levels (denoted by n) does the electron in a hydrogen atom return when the emission spectrum is in the ultraviolet region;
n= 1
n = 2
n = 3
n = 4
Which one of the following is the maximum number of atomic orbitals having a principal quantum number of two?
2
4
8
9
What is/are the possible value(s) of magnetic quantum number of an atomic orbital having quantum number n = 5 and l = 4?
I -4, -3, -2, -1, 0
II +1, +2, +3, +4
III +5
I only
I and II only
II and III only
I, II, and III
Which quantum number determines the orientation of the orbitals?
s
l
m
n
Which of the following subshells contain only one orbital?
7s
6p
4d
5d
Which quantum number indicates the energy level of the electron ?
Principal quantum number
Angular momentum quantum number
Magnetic quantum number
Electron spin quantum number
The ground state electronic configuration of Cr is
[Ar] 4s1 3d5
[Ar] 4s2 3d4
[Ar] 3d4
[Ar] 4s1 3d3
What is the Aufbau principle in electron configuration?
Electrons only occupy the highest energy levels first.
Electrons fill orbitals randomly without any order.
Electrons fill orbitals starting from the lowest energy level to the highest.
Electrons can skip energy levels and fill any orbital.
What does Hund's rule state about electron configuration?
Electrons fill all orbitals before pairing up.
Electrons fill degenerate orbitals singly before pairing up.
Electrons occupy the lowest energy orbitals first without regard to pairing.
Electrons pair up in the same orbital before filling others.
What electron configuration matches an oxygen ion? (Z=8)
1s22s22p63s2, 3p64s23d104p5
1s22s22p4
1s22s22p6
1s22s22p63s23p64s23d1
Which of the following represents an electron in 3d orbital?
n = 3, l = 0, m = 0, s = ± ½
n = 3, l = 2, m = -3, s = + ½
n = 3, l = 1, m = +1, s = + ½
n = 3, l = 2, m = +2, s = ± ½
Which of the following does not obey Pauli Exclusion Principle?
A
B
C
D
Identify the rule that is being violated
Aufbau's Principle
Hund's Rule
Pauli's Exclusion Principle
Heisenberg uncertainty principle
2. A 3d electron can have possible magnetic quantum number values of
-2, -1, 0, +1,+2
-2, -1, 0, and 1
3, 2, and 1
-3,-2,-1,0,+1,+2,+3
An electron cannot exist in the energy state described by which set of quantum numbers below?
(3, 2, 2, −1⁄2 )
(4, 3, 3, +1⁄2 )
(2, 1, −3, +1⁄2 )
(2, 0, 0, −1⁄2 )
