Final answer:
Elements in the same group of the periodic table exhibit similar chemical behavior due to having the same number of valence electrons. The noble gases group, which includes helium, neon, argon, xenon, and radon, have similar properties to krypton in terms of being odorless, colorless, and unreactive under normal conditions.
Step-by-step explanation:
Elements in the same group of the periodic table exhibit similar chemical behavior due to having the same number of valence electrons. One group that has similar properties to krypton (Kr) is the noble gases group, which includes elements such as helium (He), neon (Ne), argon (Ar), xenon (Xe), and radon (Rn). Like krypton, these noble gases are all odorless, colorless, and unreactive under normal conditions. They all have a full outer electron shell, making them stable and less likely to form compounds.