Answers26-27 WHS-Chemistry-1stSixWeeksAtomic Numbers and Electron Configurations

Atomic Numbers and Electron Configurations Answers

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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
2
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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
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

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
5

Which is the electron configuration for bromine?

A
1s22s22p63s23p64s23d104p5
B
1s22s22p63s23p64s23d104p6
C
1s22s22p63s23p44s23d104p5
D
1s22s22p63s23p64s23d94p5
6

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
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 lithium?

A
1s2
B
2s3
C
1s22s1
D
1s12s2
9

Which is the electron configuration for zinc?

A
1s22s22p63s23p64s23d8
B
1s22s22p63s23p64s13d10
C
1s22s22p53s23p64s23d10
D
1s22s22p63s23p64s23d10
10

Which characteristic is given by the principal quantum number?

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

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