A. <span>Sodium is oxidized and chlorine is reduced.</span>
To balance Ca + Cl2 = CaCl2 you'll need to be sure to count all of atoms on each side of the chemical equation.
Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation for Calcium + Chlorine gas.
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C. Oxidized and reduced are the same.
Answer is: periodicity.
For example in chemistry periodicity is pattern present in the periodic table that show different aspects of a certain element (atomic radius, electronegativity, ionization energy, electron affinity, melting point, boiling point, metallic character, ionic radius and reactivity).
