AnswersChemistry Honors AElectrons and the Periodic Table

Electrons and the Periodic Table — Unit test Answers

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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
2
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Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to write out?

A
a set of quantum numbers for the last electron in the atom
B
a configuration with numbers, letters, and superscripts
C
a dot structure of the atom
D
an orbital notation of the atom
3

An atom of an element is shown by the model.How is this model useful?

Question illustration
A
It shows how electrons are distributed in the shells of an iron atom.
B
It shows how electrons are distributed in the shells of a cobalt 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.
4

Which shows the electron configuration for Silicon (Si)?

A
[Ar]4s23d104p4
B
[Ar]3d14s2
C
[Ne]3s23p4
D
[Ne]3s23p2
5

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

A
The stream of cathode ray particles was moving very slowly.
B
The glass opposite of the negative electrode started to glow.
C
The electric voltage had little effect on the stream of particles.
D
The tube contained two pieces of metal that served as electrodes.
6

Which statement describes heterogeneous mixtures?

A
They are made up of two or more pure substances that are not chemically bonded together and appear non-uniform.
B
The substances they are composed of can only be separated chemically.
C
The substances they are composed of have fixed ratios between their components.
D
They are made up of two or more pure substances that are chemically bonded together and appear uniform.
7

What is the electron configuration for helium (He)?

A
1s1
B
1s2
C
1s22s1
D
1s22s2
8

Which is a set of valid quantum numbers?

A
n = 4, l = 4, m = 4
B
n = 1, l = –2, m = 0
C
n = –1, l = 0, m = 0
D
n = 4, l = 3, m = 3
9

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

A
Ar
B
Ca
C
F
D
Ni
10

The symbol for xenon (Xe) would be a part of the noble gas notation for the element

A
antimony.
B
cesium.
C
radium.
D
uranium.
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 atom emits light with more energy.
B
The second atom emits light with more energy.
C
The first and second atoms absorb energy without emitting light.
D
The first and second atoms emit light with the same amount of energy.
12

How many electrons can the n = 4 shell hold?

A
8
B
16
C
32
D
64
13

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

A
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.
Option A
B
A red circle with a large, faint plus sign visible contains 10 small orange circles labeled with minus signs.
Option B
C
An orange circle bounded by a heavier, darker orange line surrounds the word Atom.
Option C
D
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.
Option D
14

The table below gives the data that is needed to calculate the average atomic mass of element B.IsotopeAtomic mass (amu)Relative abundance (%)B-1010.0119.91B-1111.0180.09Based on these data, what is the average atomic mass of element B?

A
10.01
B
10.51
C
10.81
D
11.01
15

Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the atomic structure help to explain?

A
Democritus
B
J. J. Thomson
C
Ernest Rutherford
D
Joseph Proust

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