Question

elements and isotopes (pag 5. what is a chemical element?

Explanation:

A chemical element is a pure substance consisting of atoms that all have the same number of protons in their atomic nuclei (i.e., the same atomic number). Chemical elements cannot be broken down into simpler substances by ordinary chemical means. For example, hydrogen (H), oxygen (O), and carbon (C) are all chemical elements. Each element is defined by its unique atomic number, which determines its chemical properties and its position in the periodic table.

Answer:

A chemical element is a pure substance made up of atoms with the same number of protons (same atomic number) in their nuclei, and it cannot be broken down into simpler substances by ordinary chemical processes.