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Section 5.4
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1
Atoms of elements in the same group have...
A)different numbers of subatomic particles in their outermost energy levels.
B)the same number of protons in their nuclei.
C)the same number of neutrons in their outer energy levels.
D)the same number of electrons in their outermost energy levels.
2
Sulphur’s valence electrons are found in…
A)the first energy level.
B)the second energy level.
C)between the nucleus and the first energy level.
D)the outermost energy level.
3
Which of the following elements has a full outer energy level?
A)oxygen
B)lithium
C)argon
D)hydrogen
4
How many electrons must alkaline earth metals lose to have a full set of valence electrons?
A)one
B)two
C)four
D)six
5
Why is potassium a more reactive element than sodium?
A)Potassium has eight valence electrons.
B)Potassium has a smaller nucleus than sodium.
C)Potassium’s valence electron is in the fourth energy level.
D)Potassium’s valence electrons are in the second energy level.





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