What is the BEST reason why some scientific theories change over time? a. Information is always changing.
b. New research produces additional information.
c. Scientists communicate more with each other.
d. We understand things better now than scientists did long ago.

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles