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

Atomic Numbers and Electron Configurations Answers

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The electron configuration for magnesium is shown below.1s22s22p63s2Which diagram shows the correct distribution of electrons in the electron shells of a magnesium atom?

A
A gray circle labeled 3 P 4 N is surrounded by two concentric circles. The inner circle has gray dots at the north and south positions, and the outer circle has a dot at the north position.
Option A
B
A gray circle labeled 4 P 5 N is surrounded by two concentric circles. Each of the concentric circles has gray dots at the north and south positions.
Option B
C
A gray circle labeled 12 P 12 N is surrounded by three concentric circles. The innermost circle has gray dots at the north and south positions; the middle circle has eight gray dots equally spaced around the circle, with dots aligned with those in the inner circle; the outer circle has gray dots at the north and south positions.
Option C
D
A gray circle labeled 12 P 12 N is surrounded by three concentric circles. The innermost circle has gray dots at the north and south positions; the middle circle has eight gray dots equally spaced around the circle, with dots aligned with those in the inner circle; the outer circle has a gray dot at the north position.
Option D
2
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Consider the model of the nitrogen atom.Which electron configuration matches this model?

Question illustration
A
1s22s22p2
B
1s22s22p3
C
1s22s22p4
D
1s22s22p5
3

To show the electron configuration for an atom, what is the advantage of using an orbital notation compared to a dot structure?

A
Orbital notation takes up less space.
B
Orbital notation shows the spin of the electrons.
C
Orbital notation makes it easier to count the electrons.
D
Orbital notation shows the electron distribution in shells.
4

Which characteristic is given by the principal quantum number?

A
orbital size
B
orbital mass
C
orbital shape
D
orbital orientation
5

The electron configuration for Helium (He) is shown below. 1s2 Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?

A
A gray circle labeled 1 P 0 N is surrounded by a concentric circle with one gray dot at the north position.
Option A
B
A gray circle is labeled 5 P 6 N. It is surrounded by two concentric circles. The inner circle has gray dots at the north and south positions. The outer circle has three evenly spaced dots; none of these align with the dots in the inner circle.
Option B
C
A gray circle is labeled 2 P 2 N. A concentric circle surrounding it has two gray dots, at the north and south positions.
Option C
D
A gray circle is labeled 6 P 6 N is surrounded by two concentric circles. The inner circle has dots at the north and south positions; the outer circle has dots at the north, south, east, and west positions.
Option D
6

Which is the electron configuration for boron?

A
1s22s3
B
1s22s23s1
C
1s12s22p2
D
1s22s22p1
7

Which set of numbers gives the correct possible values of l for n = 3?

A
0, 1, 2
B
0, 1, 2, 3
C
–2, –1, 0, 1, 2
D
–3, –2, –1, 0, 1, 2, 3
8

Which is the electron configuration for zinc?

A
1s22s22p63s23p64s23d8
B
1s22s22p63s23p64s13d10
C
1s22s22p53s23p64s23d10
D
1s22s22p63s23p64s23d10
9

Consider the model of a sodium atom.Which feature does the model show accurately?

Question illustration
A
the size of the electrons in different shells
B
the shapes of the orbitals in different shells
C
the distribution of electrons in different shells
D
the orientation of the orbitals in different shells
10

Consider the electron configuration. 1s 2s 2p 3s 3p Which element has this electron configuration?

Question illustration
A
astatine
B
bromine
C
chlorine
D
fluorine
11

Each atom of an element has the following electron configuration.1s22s22p63s23p64s23d104p65s24d105p5What is the name of the element?

A
bromine
B
iodine
C
tellurium
D
xenon
12

If a shell can hold a maximum of 32 electrons, what is the value of n?

A
2
B
3
C
4
D
5
13

Which is the electron configuration for boron?

A
1s22s3
B
1s22s23s1
C
1s12s22p2
D
1s22s22p1
14

Two representations of the distribution of electrons in the potassium atom are shown. Model 1 Model 2 1s22s22p63s23p64s1 Which model is useful in showing the reactivity of potassium?

Question illustration
A
Neither model is able to show the reactivity of potassium.
B
Model 1 because it shows an electron in the 4s orbital.
C
Model 2 because it shows an electron in the outermost ring.
D
Both models because each shows an electron in the outermost shell.
15

The electron configuration for magnesium is shown below.1s22s22p63s2Which diagram shows the correct distribution of electrons in the electron shells of a magnesium atom?

A
A gray circle labeled 3 P 4 N is surrounded by two concentric circles. The inner circle has gray dots at the north and south positions, and the outer circle has a dot at the north position.
Option A
B
A gray circle labeled 4 P 5 N is surrounded by two concentric circles. Each of the concentric circles has gray dots at the north and south positions.
Option B
C
A gray circle labeled 12 P 12 N is surrounded by three concentric circles. The innermost circle has gray dots at the north and south positions; the middle circle has eight gray dots equally spaced around the circle, with dots aligned with those in the inner circle; the outer circle has gray dots at the north and south positions.
Option C
D
A gray circle labeled 12 P 12 N is surrounded by three concentric circles. The innermost circle has gray dots at the north and south positions; the middle circle has eight gray dots equally spaced around the circle, with dots aligned with those in the inner circle; the outer circle has a gray dot at the north position.
Option D
16

Which characteristic is given by the principal quantum number?

A
orbital size
B
orbital mass
C
orbital shape
D
orbital orientation
17

Consider the model of the nitrogen atom.Which electron configuration matches this model?

Question illustration
A
1s22s22p2
B
1s22s22p3
C
1s22s22p4
D
1s22s22p5
18

Which diagram shows a pair of electrons that have opposite spins?

A
A box contains an upward pointing and a downward pointing arrow.
Option A
B
A box contains an upward pointing arrow.
Option B
C
A box contains an upward pointing arrow.
Option C
D
A box contains two upward pointing arrows.
Option D
19

Consider the model of a sodium atom.Which feature does the model show accurately?

Question illustration
A
the size of the electrons in different shells
B
the shapes of the orbitals in different shells
C
the distribution of electrons in different shells
D
the orientation of the orbitals in different shells
20

Which is the electron configuration for lithium?

A
1s2
B
2s3
C
1s22s1
D
1s12s2

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