Georgia Science Grade 8

Chapter 6: Atomic Structure and Chemical Bonds

CRCT Practice

1
The illustration shows the electron configuration for potassium. How many electrons does potassium need to gain or lose to become stable?

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A)gain 1
B)gain 2
C)lose 1
D)lose 2
2
Potassium belongs to the Group 1 family of elements on the periodic table. What is the name of this group?

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A)halogens
B)alkali metals
C)noble gases
D)alkaline metals
3
What type of bond connects the atoms in a molecule of nitrogen gas (N2)?
A)ionic
B)single
C)double
D)triple
4
The illustration shows the electron distribution for magnesium chloride. Which of the following is the correct way to write the formula for magnesium chloride?

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A)Mg2Cl
B)MgCl2
C)MgCl
D)Mg2Cl2
5
Which of the following terms best describes the type of bonding in magnesium chloride?

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A)ionic
B)pooling
C)metallic
D)covalent
6
What is the maximum number of electrons in the third energy level?
A)8
B)16
C)18
D)24
7
Sodium combines with fluorine to produce sodium fluoride (NaF), an active ingredient in toothpaste. In this form, sodium has the electron configuration of which other element?
A)neon
B)magnesium
C)lithium
D)chlorine
8
The illustration shows how hydrogen and chlorine combine to form a polar molecule. Explain why the bond is polar.

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A)because chlorine is larger than hydrogen
B)because chlorine and hydrogen atoms overlap
C)because chlorine attracts electrons more strongly than hydrogen
D)because hydrogen attracts electrons more strongly than chlorine
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