NAME 1306 Student Questions on Atomic Structure Atomic - number N 16 Hydrogen Carbon Nitrogen Orygen HC Atomic- mass number Hydrogen atom Carbon atom - Nucleus The electrons, protons, and neutrons of these hydrogen and carbon atoms are shown in the diagram at left. Protons )Neutrons Electrons Questions: 1. How many protons, electrons, and neutrons does the hydrogen atom shown here have 2. What are the atomic number and the atomic mass number of the hydrogen atom? 3. What are the atomic number and the atomic mass number of the carbon isotope show? 4. Nitrogen-11 is an isotope of nitrogen that has 7 protons and 4 neutrons. What are the atomic number and atomic mass number of nitrogen-11? Answers: 1. Protons = Electrons= Neutrons - 2. Atomic number is: Atomic mass number is: 3. Atomic number is: Atomic mass number is: 4. Atomic number is: Atomic mass number is: DFocus

What if there are a different number of Neutrons? Sometimes elements have a different number of neutrons than usual, so therefore have a different atomic mass. This is what we call an Isotope (a variant form of an element which has the same number of protons but a differing number of neutrons). Sometimes we’ll see Isotopes labeled with their new mass like this: 14C = this is Carbon 14. Notice it has a different mass than what is on your periodic table The average mass of all the isotopes is defined as an element’s Atomic Weight. Can you answer questions about these Isotopes? ELEMENT ATOMIC MASS NUMBER OF PROTONS NUMBER OF NEUTRONS 14C A   B   C  15N D   E   F  2H G  H  I  Use your table to look up the number of protons, remember that never changes!

1. 2. 3. 4. 5. 6. 7. What are the top elements that make up 96% of the human body? The image here shows the periodic table designation for Magnesium. a. What is the atomic mass? b. What is the atomic number? c. Draw the atomic structure and label protons, neutrons and electrons. 12 Mg 24.305 Compare and contrast the three types of bonds: Ionic Bond Covalent Bond Hydrogen Bond How do the electrons interact in each type of bond? Define pH and explain how it is measured. What is the difference between a base and an acid? List and EXPLAIN the four important characteristics of water that allow it to sustain life? Compare and contrast dehydration synthesis and hydrolysis. Draw a diagram on the formation and breakdown of the Disaccharide Sucrose to show how this occurs.

Iodine has 37 known isotopes.  Therefore, the atomic mass has a range of 108-144 amu. Which of the following statements concerning iodine is correct? A) The isotopes of iodine have between 55 and 91 protons. B) An atom of iodine can have between 55 and 91 neutrons. C) The isotopes of iodine will always have the same number of neutrons, but the protons can vary. D) The isotopes of iodine have between 108 and 144 neutrons, but the number of protons will not vary.