1. An ion has a net charge of - 3, and 12 electrons, what is its atomic number? What element has that atomic number? 2. An ion of Celsius has a net charge of -5, how many electrons does it have?

3. Some atom has an atomic number of 46, how many electrons does it have if it has a net charge of +2?

4. How many neutrons are in an atom of Helium, and what is its mass number?

5. There are 3 neutrons in an isotope of Helium, what is its mass number?

6. n isotope has 83 neutrons and a mass number of 167, what is its atomic number? What element is defined by that atomic number?

7. What element has 54 neutrons and a mass number of 112?

8. What element has 10 electrons, a net charge of -2?