What is formed when one barium atom combines with two sodium atoms?

When two different elements combined chemically, a compound is formed. When two different elements are combined physically, a mixture is formed. In the case of barium and sodium, a mixture is formed because they are both metals and they do not combine chemically with each other.

If you mix up the chemical symbols, it will be BANANA, but a banana is a fruit, not a chemical symbol of a compound.

The actual answer is "a mixture of Barium and Sodium". That's all.