AnswersChemistryAtomic Structure and the Periodic Table

Practice Test Answers

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1
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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
2
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What was Johann Dobereiner’s contribution to the development of the periodic table?

A
He identified triads of elements that had similar properties.
B
He organized elements into four groups based on their properties.
C
He arranged the elements according to increasing atomic number.
D
He arranged the elements according to increasing atomic mass.
3

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

A
The electric voltage had little effect on the stream of particles.
B
The tube contained two pieces of metal that served as electrodes.
C
The stream of cathode ray particles was moving very slowly.
D
The glass opposite of the negative electrode started to glow.
4

Which is a set of valid quantum numbers?

A
n is equal to 4 , l is equal to 3 , m is equal to 3
B
n is equal to negative 1 , l is equal to 0 , m is equal to 0
C
n is equal to 4 , l is equal to 4 , m is equal to 4
D
n is equal to 1 , l is equal to negative 2 , m is equal to 0
5

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

A
Image with description An orange circle bounded by a heavier, darker orange line surrounds the word Atom.
B
Image with description A red circle with a large, faint plus sign visible contains 10 small orange circles labeled with minus signs.
C
Image with description A small orange circle with seven plus signs is at the center of a larger dotted circle. Between the two circles are 7 small green circles, each labeled with a negative sign.
D
Image with description A small blue circle labeled with a minus sign lies at the center of a larger circle. Spaced around the outer circle are three small green circles labeled with plus signs.
6

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

A
Heinrich Hertz
B
Isaac Newton
C
Max Planck
D
Thomas Young
7

What is the study of the spectra produced from the emission and absorption of electromagnetic radiation?

A
nanotechnology
B
spectroscopy
C
study of emission spectrum
D
study of absorption spectrums
8

Which is most likely true about electronegativity?

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

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

A
sorting
B
evaporation
C
filtration
D
boiling
10

A piece of sodium metal can be described as

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

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 second atom emits light with more energy.
C
The first atom emits light with more energy.
D
The first and second atoms emit light with the same amount of energy.
12

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

A
Ar
B
Ni
C
Ca
D
cap f
13

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
cap k is greater than Rb comma Rb is greater than Na comma Na is greater than Li
B
Rb is greater than cap k comma cap k is greater than Na comma Na is greater than Li
C
Rb is greater than cap k comma cap k is greater than Li comma Li is greater than Na
D
Li is greater than Na comma Na is greater than cap k comma cap k is greater than Rb
14

Which best describes nuclear fusion?

A
Two nuclei spontaneously combine and absorb energy.
B
Nuclei combine to form a heavier nucleus, releasing energy.
C
A nucleus spontaneously splits and absorbs energy.
D
A nucleus collides with a neutron and splits, releasing energy.
15

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
16

What elements are in the unknown sample? Choose two correct answers.

A
helium
B
boron
C
hydrogen
D
lithium
E
potassium
17

How is this model useful?

A
It shows how electrons are distributed in the shells of a cobalt atom.
B
It shows how electrons are distributed in the shells of an iron atom.
C
It shows how orbitals are distributed in the shells of an iron atom.
D
It shows how orbitals are distributed in the shells of a cobalt atom.
18

Based on these data, what is the average atomic mass of element cap b ?

A
11 point 0 1
B
10 point 5 1
C
10 point 8 1
D
10 point 0 1
19

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

A
1
B
2
C
3
D
4
20

Which type of reaction does this diagram represent?

A
an increase in energy that is caused by nuclear fusion
B
a chain reaction that is caused by nuclear fusion
C
a decrease in energy that is caused by nuclear fission
D
a chain reaction that is caused by nuclear fission

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