Modeleaza formarea legaturii ionice intre: -Calciu si brom
-Magneziu si azot
-Natriu si sulf
-Aluminiu si oxigen
-Potasiu si fosfor

magneziu si azot

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.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.