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1
(1)
What is the period of
F?
(2)
What is the period of
Ar?
(3)
What is the period of
O?
(4)
What is the period of
S?
(5)
What is the period of
N?
(6)
What is the period of
H?
(7)
What is the period of
Na?
(8)
What is the period of
Ti?
(9)
What is the period of
B?
(10)
What is the period of
Al?
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