1. The table shows atomic numbers, mass numbers, protons, neutrons, and electrons for various elements.
2. For each element, the number of protons equals the atomic number.
3. The number of neutrons is calculated by subtracting the atomic number from the mass number.
4. In a neutral atom, the number of electrons equals the number of protons.
5. For ions, the number of electrons is adjusted based on the charge: add electrons for negative ions, subtract for positive ions.
6. Example: Sodium (Na) has atomic number 11, mass number 23 → protons = 11, neutrons = 12, electrons = 11 (neutral).
7. Example: Chloride ion (Cl⁻) has atomic number 17, mass number 35 → protons = 17, neutrons = 18, electrons = 18 (gained 1 electron).
8. Fill in missing values using these rules for each row.
Parent Tip: Review the logic above to help your child master the concept of calculating protons neutrons and electrons worksheet.
