The answers D) -60
Just subtract
Answer:
Please find the explanation to this question below.
Explanation:
Six elemental gases are composed of such exceptionally stable atoms that they almost never react with other elements. They are the gases that make up Group 0 (the rightmost column) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Antimony has two naturally occurring isotopes. Their abundance is given in the pic attached below
