Answer:
2Na + Cl2 → 2NaCl
Step-by-step explanation:
Na + Cl2 → NaCl
We have two chlorines on the left but only one on the right so it needs to be balanced.
If we put a 2 in front of NaCl we now have 2 chlorines on both sides but now 2 sodiums on the left and one on the right
Add another 2 in front of Na to get the full balanced equation
2Na + Cl2 → 2NaCl