How many molecules of oxygen gas (O2) are in 8 grams of oxygen

Which element is the least metallic between cadmium, silver, zinc, or iron?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

What can be found in the ionosphere