Question

question 1 which of the following is an element?
○ tin
○ water
○ salt
○ sugar

Explanation:

An element is a pure substance made of only one type of atom. Tin (Sn) is a chemical element. Water ($H_2O$) is a compound of hydrogen and oxygen. Salt (usually $NaCl$) is a compound of sodium and chlorine. Sugar (e.g., $C_{12}H_{22}O_{11}$) is a compound of carbon, hydrogen, and oxygen. So tin is an element.

Answer:

A. tin