Final answer:
In order to balance the equation Na + 2Cl₂ → NaCl, we need to place the coefficient 2 in front of NaCl.
Step-by-step explanation:
In order to determine if the equation is balanced, we need to compare the number of each type of atom on both sides of the equation. In the given equation, Na + 2Cl₂ → NaCl, there is one sodium (Na) atom on both sides, but there are two chlorine (Cl) atoms on the left side and only one on the right side. Therefore, the equation is not balanced. To balance the equation, we need to place the coefficient 2 in front of NaCl:
2Na + Cl₂ → 2NaCl
Now, there are two sodium atoms and two chlorine atoms on both sides of the equation, so it is balanced.