- The image contains a table with columns for "Element," "Symbol," "Atomic Number," "Mass Number," "Protons," "Neutrons," and "Electrons."
- For each row, the atomic number equals the number of protons.
- The mass number equals the sum of protons and neutrons.
- For neutral atoms, the number of electrons equals the number of protons.
- For ions, the number of electrons is adjusted by the charge: add electrons for negative ions, subtract for positive ions.
- Example: For Ca²⁺, atomic number 20 means 20 protons; mass number 40 means 20 neutrons (40 - 20); charge +2 means 18 electrons (20 - 2).
- Fill in missing values using these relationships and known periodic table data.
Parent Tip: Review the logic above to help your child master the concept of identifying ionic and covalent bonds worksheet.
