Answers26-27 CFISD TX-Chemistry A CRPeriodic Trends

Periodic Trends — Unit test Answers

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Which best describes the trends in electronegativity on the periodic table?

A
Electronegativity increases up and to the right.
B
Electronegativity increases down and to the left.
C
Electronegativity decreases up and to the left.
D
Electronegativity decreases down and to the right.
2
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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
3

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.
4

Which property would xenon most likely have?

A
It is stable.
B
It is a solid.
C
It is flammable.
D
It is silver in color.
5

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
6

Which is most likely true about electronegativity?

A
It tends to be the same across a period.
B
It tends to be the same down a group.
C
It tends to increase across a period.
D
It tends to increase down a group.
7

Which element has an ion that is smaller than an ion of calcium?

A
potassium
B
strontium
C
cesium
D
magnesium
8

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
9

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.
10

How many electrons can the n = 4 shell hold?

A
8
B
16
C
32
D
64
11

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

A
Rb > K > Na > Li
B
K > Rb > Na > Li
C
Li > Na > K > Rb
D
Rb > K > Li > Na
12

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.
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

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

A
Ar
B
Ca
C
F
D
Ni
15

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

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