/ (ˌbiːtəˈtɒpɪk) /
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(of atoms) differing in proton number by one, theoretically as a result of emission of a beta particle
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Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012