UNIT 3 STUDY GUIDE Part 1 LESSON 1: Studying Atoms In JUST a FEW WORDS, describe the significance of each scientist’s work to what we understand of the ATOM today: Greek Philosophers John Dalton J.J. Thomson Earnest Rutherford Niels Bohr What is an Atom? The smallest part of an __(fill in box below)__ that still has all of the properties of that _(same term)_. LESSON 2: The Structure of an Atom List 3 subatomic particles, their charges & their location (respective to the nucleus): Name of Subatomic Particle Charge of Subatomic Particle Location of Subatomic Particle Compare the size and mass of these subatomic particles: Which of the 3 subatomic particles is VERY SMALL compared to the other? Which 2 subatomic particles have almost the SAME size and mass? From the periodic table, what are the top and bottom numbers called on any element? #12. #15. What does each number TELL US about its Element? Atomic NUMBER Atomic MASS How would you find out how many NEUTRONS there are in an atom of an element? What is an ISOTOPE? Oxygen-16 Oxygen-17 Oxygen-18 The atoms above are different isotopes of the same element. What are the 2 things about the element that this change affects? The number of The atomic Practice: https://education.jlab.org/elementmath/index.html (uncheck “nucleons” and round the atomic weight!) https://www.proprofs.com/quiz-school/story.php?title=inside-atom-atomic-number-massquiz-1 Complete the table for the Following Element: Element Name: Atomic Number Atomic Mass Protons Neutrons Electrons LESSON 3: Modern Atomic Theory The most widely-accepted model of the atom today is known as the…. How is the current model DIFFERENT from Bohr’s model of the atom? (describe how each model looks!) Bohr’s Model: Electron Cloud Model: What happens to an electron when it absorbs energy (like a photon of light)? Text pg.115 What happens to an electron when it falls back to a lower energy level (which they all want to do)?Text pg. 116 A neon sign glowing is an example of light given off when an electron does what? Text pg. 116 An Atomic Orbital is best described as…. How many electrons can be in each orbital of an atom? Complete the following table: Energy Level # of Orbitals 1 1 4 3 16 Max # of Electrons What do you call the most STABLE arrangement of electrons in an atom? And how would you describe it? Called: Described: What state is an atom in if it has an electron that has moved to a higher energy level? A PERIODIC TABLE is an arrangement of elements in columns, based on a set of PROPERTIES that repeat…... To
