Question

na₂co₃
na: ________
c: ________
o: ________

Explanation:

Step1: Count sodium atoms

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

Step2: Count carbon atoms

The sub - script of C is 1, so there is 1 carbon atom.

Step3: Count oxygen atoms

The sub - script of O is 3, so there are 3 oxygen atoms.

Answer:

Na: 2
C: 1
O: 3