1. Atomic Number
* The atomic number of an element is the most important piece of information. It's usually found on the periodic table above the element's symbol.
* The atomic number is equal to the number of protons in the atom's nucleus.
2. Protons and Electrons in a Neutral Atom
* In a neutral atom (an atom that has no overall charge), the number of protons (positive charge) is equal to the number of electrons (negative charge).
Example: Carbon (C)
* Atomic number of Carbon: 6
* Number of protons: 6
* Number of electrons: 6 (because it's a neutral atom)
Important Notes:
* Ions: If an atom gains or loses electrons, it becomes an ion (an atom with a charge). In this case, the number of electrons will be different from the number of protons.
* Isotopes: Isotopes of an element have the same number of protons but different numbers of neutrons. The number of protons (atomic number) defines the element, but the number of neutrons can vary.
Let me know if you'd like to practice with some specific elements!
