Question

__________ cannot be broken into simpler substances by physical or chemical methods.

Answer 1

Element

• An element is a pure substance made up of only the same type of particles or atoms.
• For example, Iron$\left(\mathrm{Fe}\right)$ is made up of only iron atoms, Silver$\left(\mathrm{Ag}\right)$ is made up of only silver atoms.
• An element is a substance that cannot be split into simpler substances by chemical means.
• Hence an element can not contain more than one type of atom.

So, an element cannot be broken into simpler substances by physical or chemical methods.