2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.
3. c) iron and nickel.
Another question on Chemistry
Chemistry, 22.06.2019 12:00
Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.
Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility