Aluminum has three extra electrons and will easily let the chlorine atoms use them. Because aluminum has three, that means three chlorine atoms can bond. They make the formula AlCl3, also known as aluminum trichloride.
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By determining the period that the element is in. For example, Calcium is in period 2 therefore its valence electron is located on energy level 2.
Explanation:
Acids and alkalis both contain ions. Acids contain lots of hydrogen ions, which have the symbol H+. Alkalis contain lots of hydroxide ions, symbol OH-. Water is neutral because the number of hydrogen ions is equal to the number of hydroxide ions