REVIEWING ATOMIC STRUCTURE PART 1: PARTS OF AN ATOM Draw a picture of the modern day model of the atom – the “Nuclear Atom”. Indicate where the following are located: 1. nucleus 2. electron cloud 4. neutrons 5. electrons
3. protons
PART 2: PROTONS AND NEUTRONS 1. What charge do the following have?
protons ______
2. Where are protons and neutrons located?
________________
neutrons ______
3. Determine the number of protons in atoms of the following elements: a. Oxygen (O) ______
b. Zinc (Zn)
______
c. Iodine (I)
d. Potassium (K) ______
e. Lead (Pb)
______
f. Silver (Ag) ______
4. Determine the atomic number and identity of the following examples: Atomic Number a. An atom with 79 protons
______
Identity of Element
b. An atom with 17 protons c. An atom with 24 protons d. An atom with 1 proton
5. Determine the mass number and the identity for the following examples: Mass Number a. An atom with 9 protons and 10 neutrons b. An atom with 29 protons and 34 neutrons c. An atom with 80 protons and 120 neutrons
Identity of Element
1
6. Determine the number of neutrons in the following atoms: a. An atom of Nitrogen with a mass number of 15
_________
b. An atom of Nitrogen with a mass number of 14
_________
c. An atom of Hydrogen with a mass number of 1
_________
d. An atom of Hydrogen with a mass number of 2
_________
e. An atom of Argon with a mass number of 40
_________
PART 3: ELECTRONS 7. Which subatomic particle is the smallest? - protons, neutrons, or electrons? ________________ 8. What does it mean for an atom to be neutral? _____________________________________________________ 9. Determine the number of electrons in the following neutral atoms. a. An atom of sulfur _______
b. An atom of Helium ________
c. An atom with 92 protons _______
10. Determine the number of protons and the identity of the following neutral atoms. Number of Protons a. An atom with 20 electrons
Identity of Element
b. An atom with 6 electrons c. An atom with 26 electrons
PART 4: REPRESENTING ELEMENTS WITH THEIR NUCLEAR SYMBOL 11. What does the superscript (top) number stand for? ___________________________ 12. What does the subscript (bottom) number stand for? ____________________________ 13. Write the nuclear symbol for the following elements: a. An atom of oxygen with a mass number of 15 ____________ b. An atom of aluminum with 14 neutrons
____________
c. An atom of fluorine with 10 neutrons
____________
2
14. Determine the number of protons, neutrons, and electrons in the following atoms: Symbol
31 23 58
Protons
Neutrons
Electrons
15P 11Na
28Ni 119 50Sn PART 5: ISOTOPES 15. When representing elements by their isotope name/symbol, you write the name or symbol followed by a dash and a number. Ex. Oxygen-17 What does the number represent? _________________________ 16. Write the isotope name/symbol for the following elements: a. An atom with 5 protons and 5 neutrons: ______________ b. An atom with 3 protons and a mass number of 7: _______________ c. A neon atom with a mass number of 21: _________________
17. How can you determine the number of protons in an atom when given just the isotope name/symbol? _____________________________________________________________________________________________ 18. How can you determine the number of neutrons in an atom when given just the isotope name/symbol? _____________________________________________________________________________________________ 19. What is an isotope? _____________________________________________________________________________________________ 20. What is the difference between “mass number” and “atomic mass”? ___________________________________ _____________________________________________________________________________________________ 20. Explain how you would calculate the average atomic mass for an element. Be sure to state what information you must be given in order to run your calculations.
3
21. Determine the average atomic mass for the following elements: a.
Isotope X-22 (percent abundance is 10.5%), Isotope X-26 (percent abundance is 40.8%) and Isotope X-27 (percent abundance is 48.7%).
b. Chlorine-35 has a percent abundance of 75.78% and Chlorine-37 has a percent abundance is 24.23%.
22. Gallium (atomic mass 69.72) has two stable isotopes. Gallium 69 has a percent abundance of 64.1%. Determine the mass number of the other Gallium isotope (percent abundance is 35.9%).
PART 6: LOCATING ELEMENTS ON THE PERIODIC TABLE 21. Identify the Group (vertical column) and the Period (horizontal row) that each of the following are in: a. Chlorine
Group: ______ Period: _____
b. Krypton
Group: ______ Period: _____
c. Hydrogen
Group: ______ Period: _____
d. Magnesium Group: ______ Period: _____
e. Lead
Group: ______ Period: _____
f. Aluminum
Group: ______ Period: _____
22. Identify the element that is located in the following spots: a. In Group 1, Period 4
Indicate where the following are located: 1. nucleus 2. electron cloud 3. protons. 4. neutrons 5. electrons. PART 2: PROTONS AND NEUTRONS. 1. What charge ...
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