Basic Atomic Structure Worksheet 1. The 3 particles of the atom are:: Protons, electrons, and nuetrons 2. Their respective charges are:: Positive p+, negative n-, neutral n* 3. The number of protons in one atom of an element determines the atom's __________, and the number of electrons determines the ____________ of the element: Identity , charge 4. The atomic number tells you the number of ________ in one atom of an element. It also tells you the number of ________ in a neutral atom of that element.: Protons , electrons 5. The atomic number gibes the "identity" of an element as well as its location on the periodic table. No two different elements will have the _________ atomic number: Same 6. The ____________ of an element is the average mass of an element's naturally occurring atom, or isotopes, taking into account the _________ of each isotope: Atomic mass (average) , percent 7. The ______________ of an element is the total number of protons and neutrons in the ___________ of the atom: Mass number , nucleus 8. The mass number is used to calculate the number of __________ in one atom of an element. In order to calculate the number of neutrons you must subtract the ___________ from the _____________: Neutrons , atomic number , mass number 9. Name the element which has the following numbers of particles: 26 electrons, 29 neutrons, 26 protons: Iron 10. Name the element which has the following numbers of particles: 53 protons, 74 neutrons: Iodine 11. Name the element which has the following numbers of particles: 2 electrons (neutral atoms): Helium 12. Name the element which has the following numbers of particles: 20 protons: Calcium 13. Name the element which has the following numbers of particles: 86 electrons, 125 neutrons, 82 protons: Lead 14. Name the element which has the following numbers of particles: 0 neutrons: Hydrogen 15. If you know ONLY the following information can you ALWAYS determine what the element is? (Yes/No): Number of protons: Yes 16. If you know ONLY the following information can you ALWAYS determine what the element is? (Yes/No): Number of neutrons: No 17. If you know ONLY the following information can you ALWAYS determine what the element is? (Yes/No): Number of electrons in a neutral atom: Yes 1/2 18. If you know ONLY the following information can you ALWAYS determine what the element is? (Yes/No): Number of electrons: No 19. Neutrons = _______ - _________: Mass number - Atomic number (Mass # Atomic #) 2/2