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Chemistry
Tutor: None Selected Time limit: 1 Day

what is the symbol and atomic number for an isotope with an mass number of 208 containing 123 neutrons? Give two answers: First the atomic symbol; then, the atomic number.

Jan 14th, 2015

The atomic symbol is: At

The atomic number is 85. You can determine this by subtracting the number of neutrons from the mass. 

Glad to be of help. 

Jan 14th, 2015

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