Which element has three electron shells and 4 valence electrons? Silicon

Carbon

Gallium

Argon

Silicon

Explanation:

For something to have 4 valence electrons, it must be in the 14th column, which elimates gallium and argon for the possible answers. For somethign to have 3 electron shells, it must be in the third row of the periodic table which means the answer is silicon.

Gallium

Explanation:

I believe this is the answer if not then the only other option is boron but anyways the answer is Gallium

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.