* Understanding Atomic Structure: Atoms are made up of protons (positive charge), neutrons (no charge), and electrons (negative charge). The number of protons determines the element (e.g., all nitrogen atoms have 7 protons).
* Electrons and Atomic Number: The number of electrons in a neutral atom is equal to the number of protons, which is the element's atomic number.
Let's look at each element:
* Nitrogen (N): Atomic number 7, so it has 7 electrons.
* Calcium (Ca): Atomic number 20, so it has 20 electrons.
* Oxygen (O): Atomic number 8, so it has 8 electrons.
* Sodium (Na): Atomic number 11, so it has 11 electrons.
Conclusion: Calcium (Ca) has the most electrons with 20.
