AnswersCISD-Chemistry A-CRUnit Test

Atomic Numbers and Electron Configurations Answers

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1
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Which characteristic is given by the principal quantum number?

A
orbital size
B
orbital mass
C
orbital shape
D
orbital orientation
2
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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
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

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

A
2
B
3
C
4
D
5
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

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

Question illustration
A
1s22s22p2
B
1s22s22p3
C
1s22s22p4
D
1s22s22p5
7

Which is the electron configuration for bromine?

A
1s22s22p63s23p64s23d104p5
B
1s22s22p63s23p64s23d104p6
C
1s22s22p63s23p44s23d104p5
D
1s22s22p63s23p64s23d94p5
8

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
9

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.
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

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