I - Table: Look at the provided photo
II - Practice Problems:
1. Write the nuclear symbol for the ion with 12 protons, 12 neutrons, and 10 electrons:
- Atomic Number (Protons): 12 (Magnesium, Mg)
- Mass Number: 12 (protons) + 12 (neutrons) = 24
- Charge: 12 protons - 10 electrons = [tex]\(2+\)[/tex]
- Nuclear Symbol: [tex]\( ^{24}_{12}\text{Mg}^{2+} \)[/tex]
2. Write the nuclear symbol for the ion with 95 protons, 148 neutrons, and 89 electrons:
- Atomic Number (Protons): 95 (Americium, Am)
- Mass Number: 95 (protons) + 148 (neutrons) = 243
- Charge: 95 protons - 89 electrons = [tex]\(6+\)[/tex]
- Nuclear Symbol: [tex]\( ^{243}_{95}\text{Am}^{6+} \)[/tex]
3. Write the nuclear symbol for the ion with 33 protons, 42 neutrons, and 36 electrons:
- Atomic Number (Protons): 33 (Arsenic, As)
- Mass Number: 33 (protons) + 42 (neutrons) = 75
- Charge: 33 protons - 36 electrons = \(3-\)
- Nuclear Symbol: [tex]\( ^{75}_{33}\text{As}^{3-} \)[/tex]
4. How many protons, neutrons, and electrons are present in this ion[tex]\( ^{40}_{17}\text{Cl}^{4+} \)[/tex]?
- Protons: 17
- Neutrons: 40 (mass number) - 17 (protons) = 23
- Electrons: 17 (protons) - 4 (charge) = 13
III. Modeling Calculations
- Chlorine-35:
- Protons: 17
- Neutrons: 18
- Electrons: 17
- Selenium-79:
- Protons: 34
- Neutrons: 45
- Electrons: 34
- Manganese-55 [tex](\(7+\))\\[/tex]:
- Protons: 25
- Neutrons: 30
- Electrons: 18 (25 protons - 7)
- Vanadium-51:
- Protons: 23
- Neutrons: 28
- Electrons: 23
- Tantalum-181:
- Protons: 73
- Neutrons: 108
- Electrons: 73
