Question

Substances that cannot be broken down into other substances are called __________. -compounds -protons -neutrons -elements

Answer 1

Substances that cannot be broken down into other substances are called elements.

Step-by-step explanation:

Elements are pure substances that cannot be broken down into other elements through any non-nuclear means. For example: hydrogen, helium, lithium, beryllium, boron, and carbon.

A list of the elements can be found in a periodic table.