State three experimental observations which show that matter is made up of particles​

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.