AnswersChemistryAtomic Structure and the Periodic Table

Practice Test Answers

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1
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Which is a set of valid quantum numbers?

A
n is equal to negative 1 , l is equal to 0 , m is equal to 0
B
n is equal to 4 , l is equal to 4 , m is equal to 4
C
n is equal to 4 , l is equal to 3 , m is equal to 3
D
n is equal to 1 , l is equal to negative 2 , m is equal to 0
2
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How many electrons can the n is equal to 4 shell hold?

A
16
B
32
C
8
D
64
3

What is the electron configuration for helium He ?

A
1 s to the 1th power
B
1 s squared
C
1 s squared 2 s to the 1th power
D
1 s squared 2 s squared
4

Which diagram best illustrates the atomic model that Rutherford derived from his gold foil experiment?

A
Image with description A diagram shows a central small circle containing a minus sign. A larger circular line surrounds this central circle. Three smaller circles, each containing a plus sign, are positioned along this circular line.
B
Image with description A large circle with an outline. Inside, a plus sign shape is centered. Ten smaller circles, each containing a minus sign, are arranged around the central plus sign shape.
C
Image with description A large circle with an outline. The word "Atom" is centered inside the circle.
D
Image with description A diagram shows a central circle containing seven plus signs. Seven smaller circles, each containing a minus sign, are arranged around the central circle. All these elements are enclosed by a larger dashed circular outline.
5

An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result?

A
The first and second atoms absorb energy without emitting light.
B
The first atom emits light with more energy.
C
The first and second atoms emit light with the same amount of energy.
D
The second atom emits light with more energy.
6

What is the predicted order of first ionization energies from highest to lowest for lithium ( Li ), sodium ( Na ), potassium ( cap k ), and rubidium ( Rb )?

A
Rb is greater than cap k comma cap k is greater than Na comma Na is greater than Li
B
Rb is greater than cap k comma cap k is greater than Li comma Li is greater than Na
C
Li is greater than Na comma Na is greater than cap k comma cap k is greater than Rb
D
cap k is greater than Rb comma Rb is greater than Na comma Na is greater than Li
7

What was Johann Dobereiner’s contribution to the development of the periodic table?

A
He arranged the elements according to increasing atomic mass.
B
He arranged the elements according to increasing atomic number.
C
He identified triads of elements that had similar properties.
D
He organized elements into four groups based on their properties.
8

Which is most likely true about electronegativity?

A
It tends to be the same across a period.
B
It tends to increase down a group.
C
It tends to increase across a period.
D
It tends to be the same down a group.
9

Which shows the electron configuration for Silicon Si ?

A
Ar times 4 times s squared times 3 times d to the 10th power times 4 times p to the 4th power
B
Ar times 3 times d to the 1th power times 4 times s squared
C
Ne times 3 times s squared times 3 times p to the 4th power
D
Ne times 3 times s squared times 3 times p squared
10

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
a pure substance and an element.
C
an impure substance that is unreactive.
D
an impure substance that is reactive.
11

To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which scientist?

A
Isaac Newton
B
Max Planck
C
Heinrich Hertz
D
Thomas Young
12

What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment?

A
The tube contained two pieces of metal that served as electrodes.
B
The electric voltage had little effect on the stream of particles.
C
The glass opposite of the negative electrode started to glow.
D
The stream of cathode ray particles was moving very slowly.
13

Which physical method can separate a mixture of steel ball bearings and marbles?

A
evaporation
B
filtration
C
sorting
D
boiling
14

Which of these properties is the best one to use for identification of an element?

A
the number of neutrons in the atomic nucleus
B
the number of isotopes that are formed by the element
C
the number of protons in the atomic nucleus
D
the number of charges on ions of the element
15

Which element would most likely have chemical properties similar to that of magnesium ( Mg )?

A
Ar
B
Ni
C
Ca
D
cap f
16

Based on the table, which atom has a charge of negative 1 ?

A
1
B
2
C
3
D
4

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