Fill in the blanks to complete the table. Symbol Z A Number of p Number of e− Number of n Charge ______ 8 ______ ______ ______ 8 2- Ca2 + 20 ______ ______ ______ 20 ______ Mg2 + ______ 25 ______ ______ 13 2+ N3 - ______ 14 ______ 10 ______ ______

Verified step by step guidance

1. Step 1: Identify the element with atomic number (Z) 8. This corresponds to oxygen (O).
2. Step 2: For the oxygen ion (O^2-), calculate the number of electrons. Since the charge is 2-, it has gained 2 electrons, so the number of electrons is Z + 2.
3. Step 3: For Ca^2+, the atomic number (Z) is 20, which means it has 20 protons. The charge is 2+, indicating it has lost 2 electrons, so the number of electrons is Z - 2.
4. Step 4: For Mg^2+, the mass number (A) is 25. The number of neutrons is A - Z. Since the charge is 2+, it has lost 2 electrons, so the number of electrons is Z - 2.
5. Step 5: For N^3-, the atomic number (Z) is 7 (since nitrogen is element 7). The charge is 3-, indicating it has gained 3 electrons, so the number of electrons is Z + 3. The number of neutrons is A - Z.