Name an element in the fourth period (row) of the periodic table with
a. five valence electrons.
b. four 4p electrons.
c. three 3d electrons.
d. a complete outer shell.
Ionian Enlightenment Thales, 585 BC Proposed water was basic stuff Anaximander, 565 BC Thought that the ultimate stuff couldn’t be identified w/ any known thing; called Aperion or boundless Anaximenes, 545 BC Thought air was the basic material; all manifest matter was the result of “refraction” or “condensation” World was understandable in...