AnswersCISD-Chemistry A-CRUnit Test

Periodic Trends Answers

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Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?

A
Be
B
Mg
C
Ca
D
Sr
2
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When electrons are added to the outermost shell of a carbon atom, it forms

A
an anion that has a larger radius.
B
an anion that has a smaller radius.
C
a cation that has a larger radius.
D
a cation that has a smaller radius.
3

Which element would release the most energy while adding an electron to a neutral atom in the gas phase?

A
Na
B
Al
C
Br
D
S
4

Which best describes ionization energy?

A
energy needed to add an electron to a neutral atom in the gas phase
B
energy needed to add an electron to a neutral atom in the liquid phase
C
energy needed to remove an electron from an atom or ion in the gas phase
D
energy needed to remove an electron from an atom or ion in the liquid phase
5

Which element has the smallest atomic radius?

A
calcium
B
potassium
C
scandium
D
titanium
6

Which element has a larger atomic radius than sulfur?

A
chlorine
B
cadmium
C
fluorine
D
oxygen
7

Which correctly summarizes the trend in electron affinity?

A
It tends to be very high for group 2.
B
It tends to be more negative across a period.
C
It tends to remain the same across periods.
D
It tends to be more negative down a group.
8

Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?

A
The ionization energy decreases because the ratio of the protons to electrons increases.
B
The ionization energy increases because the ratio of the protons to electrons increases.
C
The ionization energy decreases because the ratio of the protons to electrons decreases.
D
The ionization energy increases because the ratio of the protons to electrons decreases.
9

Which ion was formed by providing the second ionization energy to remove an electron?

A
Ca2+
B
N3–
C
Fe3+
D
S2–
10

The most negative electron affinity is most likely associated with which type of atoms?

A
large nonmetal atoms
B
small nonmetal atoms
C
large metal atoms
D
small metal atoms

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