An atom's Lewis dot structure has four dots. Which of the following elements could it be, and why? O Aluminum, because it is a metal with four electrons in period 3.
O Beryllium, because it is in period 2 and has four total electrons.
O Carbon, because it is in group 14 and has four valence electrons.
O Calcium, because it is an alkaline earth metal in period 4.​

Beryllium, because it is in period 2 and has four total electrons.

Explanation:

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

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explanation:

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