Answered

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of this nuclide?


A 19/21 K

B 21/19 K

C 40/19 K

D 19/40 K

Verified Answer :

23dancer3

I believe this nuclide is potassium with the symbol K. Atomic number for an element remains constant no matter how the mass changes. From the periodic table, potassium has an atomic number of 19.

Answer:

40/19 K or C

Explanation:

edg

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