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

The History and Arrangement of the Periodic Table Answers

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1
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Which is the electron configuration for lithium?

A
1s2
B
2s3
C
1s22s1
D
1s12s2
2
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Which is the electron configuration for bromine?

A
1s22s22p63s23p64s23d104p5
B
1s22s22p63s23p64s23d104p6
C
1s22s22p63s23p44s23d104p5
D
1s22s22p63s23p64s23d94p5
3

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
4

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

Question illustration
A
1s22s22p2
B
1s22s22p3
C
1s22s22p4
D
1s22s22p5
5

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
6

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

A
2
B
3
C
4
D
5
7

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
8

Which characteristic is given by the principal quantum number?

A
orbital size
B
orbital mass
C
orbital shape
D
orbital orientation
9

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
10

Which is the electron configuration for boron?

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

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