Context: A carbohydrate is a biological molecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen -- oxygen atom ratio of 2: 1 (as in water); in other words, with the empirical formula C (H O) (where m could be different from n). This formula holds true for monosaccharides. Some exceptions exist; for example, deoxyribose, a sugar component of DNA, has the empirical formula C H O. Carbohydrates are technically hydrates of carbon; structurally it is more accurate to view them as polyhydroxy aldehydes and ketones.

Question: list by symbol the types of atoms that can be found in carbohydrates?
Steam of consciousness below:
To answer this question, we should know that: A carbohydrate is a biological molecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen -- oxygen atom ratio of 2: 1 (as in water); in other words, with the empirical formula C (H O) (where m could be different from n).
So, the answer is carbon ( C ) , hydrogen ( H ) and oxygen ( O ).