Question

na₂so₄
na: ____
s: ____
o: ____
total: ____

Explanation:

Step1: Count sodium atoms

The sub - script of Na is 2, so there are 2 Na atoms.

Step2: Count sulfur atoms

The sub - script of S is 1 (when no sub - script is written, it is 1), so there is 1 S atom.

Step3: Count oxygen atoms

The sub - script of O is 4, so there are 4 O atoms.

Step4: Calculate total atoms

Total atoms = 2 (Na) + 1 (S)+4 (O)=7.

Answer:

Na: 2
S: 1
O: 4
Total: 7