Lists how many valence electrons are shared, gained, or lost by each atom of the 6 compounds?
n2
ccl4
sio2
alcl3
cacl2
libr

The number of electrons in an atom's outermost valence shell governs its bonding behavior.

In N₂, three electrons are being shared by each nitrogen atom, making a total of 6 shared electrons.

In CCl₄, 4 electrons are being shared by each carbon atom and 1 electron is being shared by each chlorine atom

In SiO₂, 4 electrons are being shared by each silicon atom and 2 electrons are being shared by each oxygen atom.

In AlCl₃, 3 electrons are being shared by each aluminum atom and 1 electron is being shared by each Cl atom

In CaCl₂, 2 electrons are lost by the calcium atom and 1 electron is gained by each chlorine atom

In LiBr, 1 electron is lost by the lithium atom and 1 electron is gained by the bromine atom

Reducing agents  oxidized by the reaction