Answers26-27 CFISD TX-Chemistry A CRAtomic Numbers and Electron Configurations

Atomic Numbers and Electron Configurations Answers

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For the n = 3 electron shell, which of the following quantum numbers are valid? Check all that apply.

A
l = 3
B
m = 3
C
l = 0
D
m = –2
E
l = –1
F
m = 2
2
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Which of the following sets of quantum numbers describe valid orbitals? Check all that apply.

A
n = 1, l = 0, m = 0
B
n = 2, l = 1, m = 3
C
n = 2, l = 2, m = 2
D
n = 3, l = 0, m = 0
E
n = 5, l = 4, m = –3
F
n = 4, l = –2, m = 2
3

1s22s22p63s23p64s1:

Answer not available
4

1s22s22p63s23p64s23d8:

Answer not available
5

1s22s22p63s23p64s23d104p65s24d3:

Answer not available
6

Which diagram shows the correct electron configuration for nitrogen (N)?

A
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third arrow has an up and a down arrow; the fourth has an up arrow only, and the third has no arrows. The third, fourth, and fifth lines are bracketed with the label 2 p.
Option A
B
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third, fourth, and fifth lines each have an up arrow and are bracketed with the label 2 p.
Option B
C
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third and fourth lines each have an up arrow; the fifth line has a down arrow. The third, fourth, and fifth lines are bracketed with the label 2 p.
Option C
7

1s22s22p6: ⇒ Ne 1s22s22p63s23p3: 1s22s22p63s23p64s1: 1s22s22p63s23p64s23d8: 1s22s22p63s23p64s23d104p65s24d3:

Answers:
1s22s22p63s23p3::P
1s22s22p63s23p64s1::K
1s22s22p63s23p64s23d8::Ni
1s22s22p63s23p64s23d104p65s24d3::Nb
8

B: 1s2 2sA2pBA = B =

Answers:
Part 1:2
Part 2:1
9

The electron configuration for aluminum (Al) is shown below:1s22s22p63s23p1Which diagram shows the correct distribution of electrons in the electron shells of an aluminum atom?

A
A small orange dot is surrounded by 5 concentric circles. The inner ring has green dots at the north and south positions. The second ring has green dots at east and west. The third ring has six dots, at the north, northeast, southeast, south, southwest, and northwest. The fourth ring has dots at the north and south, and the outer ring has one dot at the west position.
Option A
B
A small orange dot is surrounded by two concentric circles. The inner circle has 6 green dots spaced approximately evenly across the circle. The outer circle has 7 dots, also approximately evenly spaced; none are aligned with dots in the inner circle.
Option B
C
An orange dot has 3 concentric circles surrounding it. The innermost circle has green dots at the north and south positions. The center circle has 8 dots spaced unevenly. The outer circle has three dots, spaced so that two are closer to each other than either is to the third.
Option C
D
An orange dot is surrounded by a concentric circle. 13 closely spaced green dots lie on that outer circle.
Option D
10

What rule/principle states that electrons fill orbitals from lowest energy to highest energy?

A
Aufbau principle
B
Hund’s rule
C
Pauli exclusion principle
11

Which diagram shows the correct electron configuration for fluorine (F)?

A
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third and fourth lines each have an up and a down arrow; the fifth line has an up arrow . The third, fourth, and fifth lines are bracketed with the label 2 p.
Option A
B
A group of five short lines. the first line has an up and a down arrow, and is labeled 1 s. The second has an up and a down arrow and is labeled 2 s. The third has an up and a down arrow, the fourth has an up, a down, and an up arrow, and the fifth has no arrow. The third, fourth, and fifth lines are bracketed and labeled 2 p.
Option B
C
A group of five short lines. The first line has an up, a down, and an up arrow and is labeled 1 s. The second line has an up, a down, and an up arrow and is labeled 2 s. The third, fourth, and fifth lines all have up arrows, and are bracketed with the label 2 p.
Option C
12

1s22s22p63s23p3:

Answer not available
13

B =

Answer not available
14

Did your answer include at least one of the items listed in each category below?

A
Dot structures make it easy to count electrons and they show the number of electrons in each electron shell.
B
Arrow and line diagrams show the spin of electrons and show every orbital.
C
Written configurations require minimal space and show the distribution of electrons between subshells.
15

What rule/principle states that electrons in the same sublevel (p, d, or f) are placed in individual orbitals, before they are paired up, to increase atomic stability?

A
Aufbau principle
B
Hund’s rule
C
Pauli exclusion principle
16

Na: 1s22sC2pD3sEC = D = E =

Answers:
Part 2:6
Part 3:1
17

D =

Answer not available
18

E =

Answer not available

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