Question 1

For which of the following elements does the electron configuration for the lowest energy state show a partially filled d orbital?
A) S
B) Ca
C) Rb
D) Kr
E) Ti

Accepted Answer

The electron configuration for Ti in its ground state is [Ar] 3d2 4s2, indicating that the d orbital is partially filled. None of the other choices have a partially filled d orbital in their ground state electron configurations.

Question 2

What is the electron configuration for Cr²⁺? A) [Ar] 4s¹3d⁵ B) [Ar] 4s²3d⁴ C) [Ar] 4s²3d² D) [Ar] 3d⁴ E) none of these

Accepted Answer

The answer of What is the electron configuration for Cr²⁺? A)...

Question 3

What is the electron configuration of Ti²⁺? A) [Ar] 3d² B) [Ar] 4s² C) [Ar] 4s¹3d¹ D) [Ar] 4s²3d² E) none of these

Accepted Answer

The given electron configuration format is incorrect and does not follow standard notation, making all provided options invalid.

Question 4

How many of the following electron configurations for the species in their ground state are correct? 
A) 1
B) 2
C) 3
D) 4
E) 5

Accepted Answer

The answer of How many of the following electron configurations...

Question 5

Which atom has three 2p electrons in its ground state?
A) Si
B) As
C) N
D) P
E) none of these

Accepted Answer

Nitrogen (N) has an atomic number of 7, which means it has 7 electrons. In its ground state, these electrons are arranged as 1s² 2s² 2p³, indicating that it has three electrons in the 2p orbital.

Question 6

How many unpaired electrons are there in an atom of sulfur in its ground state?
A) 1
B) 2
C) 4
D) 0
E) 3

Accepted Answer

An atom of sulfur has 16 electrons. In its ground state, the electron configuration of sulfur is 1s²2s²2p⁶3s²3p⁴. The valence shell of sulfur is the 3p shell, which contains 4 electrons. In the ground state, there are two unpaired electrons in the 3p shell of sulfur. Therefore, the answer is B) 2.

Question 7

Which of the following atoms has 3 electrons in p orbitals in its valence shell?
A) Ba
B) Ga
C) Bi
D) V
E) none of these

Accepted Answer

The answer of Which of the following atoms has 3...

Question 8

What is the electron configuration of Co³⁺? A) [Ar] 3d⁶ B) [Ar] 4s²4d⁴ C) [Ar] 3d⁴ D) [Ar] 4s²3d⁴ E) none of these

Accepted Answer

The answer of What is the electron configuration of Co³⁺? A)...

Question 9

How many unpaired electrons does chlorine have in its ground state?
A) 2
B) 3
C) 17
D) 1
E) none of these

Accepted Answer

Chlorine has 7 valence electrons, meaning it has one unpaired electron in its ground state.

Question 10

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?
A) 32
B) 2
C) 50
D) 8
E) 18

Accepted Answer

The total number of electrons that can be accommodated in a level corresponding to n = 5 is given by the formula 2n^2. For n = 5, this equals 2*(5^2) = 2*25 = 50.

Question 11

The number of unpaired electrons in the outer subshell of a Cl atom is
A) 0
B) 1
C) 3
D) 2
E) none of these

Accepted Answer

Chlorine (Cl) has 7 electrons in its outermost shell, and it requires one more electron to complete its octet. Therefore, it has one unpaired electron in the outer subshell.

Question 12

An atom of nitrogen contains 7 electrons. How many of these electrons are in p orbitals?
A) 3
B) 6
C) 10
D) 2
E) 8

Accepted Answer

Nitrogen has an electron configuration of 1s² 2s² 2p³, meaning there are 3 electrons in the 2p orbital.

Question 13

How many unpaired electrons does arsenic have in its ground state?
A) 33
B) 3
C) 1
D) 2
E) none of these

Accepted Answer

Arsenic has an atomic number of 33, which means it has 33 electrons in its neutral state. Following Aufbau's principle, the electrons fill the orbitals in order of increasing energy. The electron configuration of arsenic in its ground state is [Ar]3d10 4s2 4p3.

The 4s and 4p orbitals are in the valence shell of arsenic, which means there are 5 valence electrons. In its ground state, the electrons are paired in the 4p subshell, except for one electron, which is unpaired. Therefore, arsenic has 1 unpaired electron in its ground state, making choice C incorrect. The other choices (A, D, and E) are also incorrect as they do not match with the number of unpaired electrons in arsenic's ground state. Hence, the correct answer is B.

Question 14

For which element are the d orbitals completely filled in the neutral atom?
A) bromine
B) phosphorus
C) potassium
D) vanadium
E) iron

Accepted Answer

The answer of For which element are the d orbitals...

Question 15

What is the valence electron configuration of S? A) 3s²3p⁴ B) 4s²4p⁴ C) 1s²2s²2p⁶3s²3p⁴ D) 1s²2s²2p⁴ E) none of these

Accepted Answer

The answer of What is the valence electron configuration of...

Question 16

What is the electron configuration for the chromium atom? A) [Kr] 4s¹3d⁵ B) [Ar] 4s²3d⁴ C) [Kr] 4s²3d⁴ D) [Ar] 4s¹3d⁵ E) none of these

Accepted Answer

The answer of What is the electron configuration for the...

Question 17

How many valence electrons do the alkaline earth metals have?
A) 8
B) 2
C) 7
D) 3
E) 1

Accepted Answer

Alkaline earth metals have two valence electrons, as they belong to group 2 of the periodic table.

Question 18

Which of the following electron configurations is correct? A) Ca: [Ar]4s¹3d¹⁰ B) Mo: [Kr]5s²4d⁵ C) Br: [Kr]3d¹⁰4s²4p⁷ D) Bi: [Xe]6s²4f¹⁴5d¹⁰6p³ E) Ga: [Kr]3d¹⁰4s²4p¹

Accepted Answer

The correct electron configuration for Bismuth (Bi) is [Xe]4f^14 5d^10 6s^2 6p^3, which closely matches the format of option D, despite the unconventional notation used.

Question 19

What is the electron configuration of indium? A) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4d¹⁰4p¹ B) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p¹5d¹⁰ C) 1s²3s²2p⁶3s²3p⁶4s²4p⁶4d¹⁰5s²5d¹⁰5p¹ D) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p¹ E) none of these

Accepted Answer

The answer of What is the electron configuration of indium?
A)...

Question 20

An element has the electron configuration [Kr] 4d¹⁰5s²5p². The element is a(n) A) actinide. B) metal. C) transition element. D) lanthanide. E) nonmetal.

Accepted Answer

The answer of An element has the electron configuration [Kr]...

Quiz 12: Quantum Mechanics and Atomic Theory

For which of the following elements does the electron configuration for the lowest energy state show a partially filled d orbital?

What is the electron configuration for Cr2+?

What is the electron configuration of Ti2+?

How many of the following electron configurations for the species in their ground state are correct?

Which atom has three 2p electrons in its ground state?

How many unpaired electrons are there in an atom of sulfur in its ground state?

Which of the following atoms has 3 electrons in p orbitals in its valence shell?

What is the electron configuration of Co3+?

How many unpaired electrons does chlorine have in its ground state?

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?

The number of unpaired electrons in the outer subshell of a Cl atom is

An atom of nitrogen contains 7 electrons. How many of these electrons are in p orbitals?

How many unpaired electrons does arsenic have in its ground state?

For which element are the d orbitals completely filled in the neutral atom?

What is the valence electron configuration of S?

What is the electron configuration for the chromium atom?

How many valence electrons do the alkaline earth metals have?

Which of the following electron configurations is correct?

What is the electron configuration of indium?

An element has the electron configuration [Kr] 4d105s25p2. The element is a(n)

What is the electron configuration for Cr²⁺?

What is the electron configuration of Ti²⁺?

What is the electron configuration of Co³⁺?

An element has the electron configuration [Kr] 4d¹⁰5s²5p². The element is a(n)