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atomic spectrum

n.
1.(physics) a spectrum of radiation caused by electron transitions within an atom

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  • Idiom of the Day

    hear from (someone)
    to receive a letter or phone call or news from someone
    I have not heard from my university roommate for over one year.



    1.
    I am vexed (a) at him about what (b) he has done. (c) No error (d)

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