11. For each set of elements, highlight the two that will be most similar in their chemical and physical properties. (The two that are most similar are in the same group)
a. He, KI, Li
b. Mg, H, Ca
C. O, CI, S
d. N, Li, K

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.