--- are a group of elements that zig-zag on the Periodic Table and separate the metals from tne nonmetals. *
A. Metalloids
B. Semiconductors
C. Cations
D. Alkaline Earth Metals

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.

What is the effect of returning nuclear reactor cooling water back into bodies of water?