Which of the following pairs of elements would have the most similar properties? A. Hydrogen (H) and Helium (He) because they are both gasses

B. Sodium (Na) and Potassium (K) because they have similar reactivity

C. Antimony (Sb) and Silicon (Si) because they are both metalloids

D. Aluminum (Al) and Magnesium (Mg) because they are both silver

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->

Which characteristics can be used to differentiate star systems? check all that apply.

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".