The outer electron shell is known as a(an) ________.

A) Distant ring
B) Unstable shell
C) Valence ring
D) None of these


C) Valence ring

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The refrigerant in an absorption chiller is

A) lithium bromide B) HCFC 123 C) water D) HFC 134a

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When the 8051 microcontroller is reset, the program counter starts at

A) 0001H. B) 1000H. C) 1111H. D) 0000H.

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