Question

How many oxygen atoms are there in Na₂SO₄?

a) 4
b) 6
c) 8
d) 10

Answer 1

There are 4 oxygen atoms in the compound Na₂SO₄, which corresponds to the sulfate ion SO₄²⁻ within the compound.

Step-by-step explanation:

To determine how many oxygen atoms are in Na₂SO₄, we need to look at the formula and count the number of oxygen atoms that the chemical formula specifies. The formula Na₂SO₄ includes the sulfate ion (SO₄²⁻), and this ion contains 4 oxygen atoms. As there is one sulfate ion in sodium sulfate (Na₂SO₄), the answer is:

There are 4 oxygen atoms in Na₂SO₄.

So, the correct answer to the question is (a) 4.