Which of the following are not grouped according to similar chemical properties? a. ruthenium, iridium, palladium b. iron, copper, ruthenium c. cobalt, iron, nickel d. gold, silver, copper

Letters A, B and C are the answers because the chemical properties depend on the number of valence shell electrons

The answer to the question presented above would be letter b.) Ruthenium, iridium, palladium. This is the answer because they are  not grouped according to chemical properties. All the other choices are grouped according to similarities in chemical properties.

Ignore my writing answer is in pictute