Mula for the polyatomic ion.
mmonium ion:
A chromate ion consists of four oxygen atoms
bonded to a chromium atom. It has two extra
electrons. The formula of this ion.
Cr402-
o
cro,2+
Cro₂2-
nitrate ion:
DONE

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.