Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Chapter 4 Atomic Structure THE HISTORY: Refer to your inspiration app time line to study! Exercise: Relate the main atomic theory models to the following treats! Gobstopper Tootsie pop Chocolate chip cookie Jellybean THE ATOM: An atom is the smallest particle of an element that retains its ______________________. How small is an atom? What is the structure of an atom? Subatomic Particles Particle Symbol Proton Neutron Electron p+ n e- Mass (g) 1.67x10-24 1.67x10-24 9.11x10-28 Relative Mass Relative (mass of Charge proton =1) 1 +1 1 0 1/1840 -1 Location in Atom Inside Nucleus Inside Nucleus Outside Nucleus THE ELEMENTS: What makes elements different from one another? atomic number (Z) = mass number (A) = element symbol (X) = Note: mass number= Therefore …. Number of neutrons = Note: For any given element on the periodic table: Number of protons = In order to symbolically represent elements and isotopes chemists use the following notation: Mass Number X Atomic number Ex: Oxygen Isotopes are atoms with identical atomic numbers but different mass numbers (that is, same number of protons but different number of neutrons) Note: they also have different mass numbers. Exercise: 1. How many protons, electrons, and neutrons are in an atom of 197Au ? 2. Magnesium has three isotopes, with mass numbers of 24, 25, 26. a. Write the complete chemical symbol for each of them. b. How many neutrons are in an atom of each isotope? 3. Fill in the gaps in the following table, assuming each column represents a neutral atom. 65 Zn Symbol Protons 44 Neutrons 57 Electrons Mass no. 92 49 38 47 108 238