Question

Give the nudlear symbol for the isotope of gallium, Ga, that contains 40 neutrons per atom. Ga Replace the question marks with the proper integers. If necessary, use the button that looks like two red arrows to clear your changes and return the answer box to its original staie.

Answer 1

A gallium atom with 40 neutrons does indeed have a mass number of 71, since the mass number is the sum of the nucleons (protons and neutrons), but the convention for writing the isotope is (atomic number) (symbol) (mass number), and so the symbol is 31Ga71.

In a perfect world where we can actually use subscripts and superscripts, the 31 is subscripted and the 71 is superscripted. This is much easier to include in manuscripts than the format where the subscripted atomic number is placed below the superscripted mass number on the left hand side of the symbol. Even the Handbook of Chemistry and Physics uses the (atomic number) (symbol) (mass number) format along with the appropriate subscripting and superscripting.

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