Which statement explains how the periodic table is arranged? . a.. the periodic table is arranged by the radioactivity levels in unstable nuclei of elements.. b.. the periodic table is arranged by the outermost electrons of the elements.. c.. the periodic table is arranged by increasing atomic mass.. d.. the periodic table is arranged by number of neutrons found within the most common isotopes.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.