Which of the following series of elements is ordered according to decreasing reactivity a) Mg, Si, Cs, He
b) Cs, Mg, Si, He
c) He, Cs, Si, Mg
d) Si, He, Cs, Mg

Identify which properties could correspond to solids, plasmas, or both. maintain a unique shape. collide infrequently with other particles. have very high velocities. conduct electricity. protons. have a low temperature. has long-range order.

Evaluate this exponential expression,8. (2 + 3)2 – 42

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?