Here's why:
* Atomic Number: The atomic number is a fundamental property of an element and defines its identity. It's represented by the symbol 'Z'.
* Protons: Protons are positively charged particles located in the nucleus of an atom.
* Neutrality: A neutral atom has an equal number of protons (positive charge) and electrons (negative charge). This balance ensures the atom has no overall electrical charge.
* Unionized: A unionized atom means the atom has not gained or lost any electrons.
Therefore, the number of protons determines the atomic number, and in a neutral, unionized atom, the number of protons is equal to the number of electrons.
