21) What is the name of the element with atomic number 8?
22) What type of bond occurs between two atoms sharing a pair of electrons?
23) What type of reaction results in the formation of new products?
24) What is the name of the process that represents the unbalanced exchange of electrons between two species?
25) At what temperature are all particles in a substance in constant motion?
26) What is the name of the process in which substances combine chemically to form a new product?