Predict the geometry and draw the structure of Phosphorus pentachloride, PC15.

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.

How is the atomic number of a nucleus changed by alpha decay

Chemistry worksheet - i am not sure what they are asking for exactly?