Which of the following statements correctly explains the difference between elements and compounds?
1 compounds can be broken down into simpler substances by physical means, while element can be broken down into simpler substances by chemical means.
2 compounds can be broken down into simpler substances by chemical means, while elements cannot.
3 compounds can be broken down into simpler substances by chemical or physical means, while elements can only be broken down into simpler substances by chemical means.
4 elements can be broken down into simpler substances by chemical means, while compounds cannot.