The average atomic mass recorded on the periodic table for krypton is 83.80 u. this indicates that the most abundant isotope of krypton is

krypton-82.

krypton-83.

krypton-84.

krypton-85.

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Why are the trends and exceptions to the trends in ionization energy observed?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)