Florida Science Grade 8

Chapter 5: Atomic Structure and Chemical Bonds

Standardized Test Practice

1
Which describes the change in the magnesium's electron distribution when magnesium chloride forms?

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SC.A.2.3.1
A)One electron is gained from each chlorine atom.
B)Two electrons are lost to each chlorine atom.
C)Two electrons are gained from each chlorine atom.
D)One electron is lost to each chlorine atom.
2
How many electrons does an uncharged magnesium atom have in its outer energy level.

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SC.A.2.3.1
A)4
B)6
C)2
D)8
3
Carbon dioxide is a molecular compound. Which type of bonding does it have? SC.A.2.3.1
A)covalent
B)ionic
C)metallic
D)pooling
4
What is the maximum number of electrons that can be in an atom's 4th energy level? SC.A.2.3.1
A)32
B)8
C)10
D)18
5
What is the correct way to write the formula for hydrogen fluoride shown in the illustration?

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SC.A.2.3.1
A)HF2
B)HF
C)H2F
D)H2F2
6
What term refers to a neutral particle formed when atoms share electrons? SC.A.2.3.1
A)bond
B)molecule
C)ionic compound
D)metal
7
Which group of elements in the periodic table have stable energy levels? SC.A.2.3.2
A)alkali metals
B)noble gases
C)alkaline metals
D)halogens
8
Each nitrogen atom has 5 electrons in its outer energy level. How many pairs of electrons are shared in a molecule of nitrogen gas (N2)? SC.A.2.3.2
A)2
B)4
C)3
D)5
9
Which of these substances is unlikely to have ionic bonds? SC.A.2.3.1
A)KCl
B)SiC
C)CaF2
D)MgO
10
Halogens are which group on the periodic table? SC.A.2.3.2
A)Group 1
B)Group 2
C)Group 17
D)Group 16
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