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2. Atoms and the Periodic Table - 4! 1부
2. Atoms and the Periodic Table / Isotopes / 문제 7
문제 7

Identify the symbols for the isotopes below in the X-A notation (e. g. B-10):
a. argon with 21 neutrons
b. uranium with 231 neutrons
c. nitrogen with 7 neutrons
d. bromine with 45 neutrons