What is difference between groups and periods? 8th grade science idk what to put it under

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

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.

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released