Final answer:
The elements among the given substances are tin, chromium, arsenic, and nickel.
Step-by-step explanation:
The elements among the given substances are tin (symbol: Sn), chromium (symbol: Cr), arsenic (symbol: As), and nickel (symbol: Ni).
Elements are substances that cannot be broken down into simpler substances by any chemical means. They are composed of only one type of atom.
For example, tin is an element with the symbol Sn. It is a silvery-white metal that is commonly used for making cans and other metal products. Chromium is another element with the symbol Cr, known for its use in stainless steel and other metal alloys.