PPT-4.4 Atomic Number and Mass Number

All atoms of an element have the same number of protons and the same atomic number Learning Goal Given the atomic number and the mass number of an atom state the number of protons neutrons and electrons. m. Couturier. Understanding Atoms and the Periodic Table of elements. The atom. Atoms are made up of three sub-atomic particles: protons, neutrons and electrons.. Protons are positively charged particles which reside in the nucleus of an atom. It is the proton that defines the element.. What is the atomic number of copper (Cu). What element has 80 protons. An isotope of magnesium (Mg) has a mass number of 26. How many neutrons does it have?. Germanium (. Ge. ) isotopes have the following natural abundance. . Most matter is a molecular mixture of these 118 different elements. . Mostly THESE 12 elements.. Most matter is a molecular mixture of these 118 different elements. . Mostly THESE 12 elements.. They are the letters of the MATTER alphabet.. Today you need your notebook and Laptop. Open the PowerPoint on the weebly. . In your notebook answer the following questions: . What two particles does the nucleus contain?. Which subatomic particle has the smallest mass?. 10/29/14. Changes Matter. Period 1. Period 4. Period 5. Period 6. CATALYST. What do you think an atom is?. *Answer in complete sentences!. Homework:. Binder. Notes (front). TURN IN write-ups if you didn’t yesterday. The lab technician shown here is using a magnifying lens to examine a bacterial culture in a petri dish. When scientists cannot see the details of what they study, they try to obtain experimental data that help fill in the picture.. https://youtu.be/. hhbqIJZ8wCM. What is an Atom?. The simplest particle of an element that retains its properties.. Who is Democritus?. This Greek philosopher was among the first to suggest the existence of atoms . Pre-AP Chemistry. Charles Page High School. Stephen L. Cotton . Section 4.1 Defining the Atom. OBJECTIVES:. Describe. Democritus’s ideas about atoms.. Section 4.1 Defining the Atom. OBJECTIVES:. Explain. Chapter 3. Types of Models – Why do we use models?. Physical Model vs. Conceptual Model. Physical model. is a representation of a very large or small object shown at a convenient scale. . Ms. Millimet. August 15, 2013. Walk in classroom silently. Pick up papers that you need from side table then walk to your seat (Keep walking forward, do not turn around). Check board and Sit down at your desk. . Pre-AP Chemistry. Charles Page High School. Stephen L. Cotton . Section 4.1 Defining the Atom. The Greek philosopher . Democritus. He believed that atoms were . indivisible. . and . indestructible. Dalton’s Atomic Theory. III. How atoms differ. . A. Atomic Number. Equal to the number of protons – never changes; equals the number of electrons if AND ONLY IF the atom is . neutral. ; Moseley discovered . each atom has a unique number of protons in the nucleus. We now have much evidence that an atom is made of a nucleus and electrons orbiting around the nucleus. What did people think before?. Even back in the days of Plato and Aristotle, people were debating whether or not matter could be cut in half indefinitely. 2.3: Atomic structure & symbolism. Write & interpret symbols that depict atomic number, atomic mass and charge of atoms & ions. Define the atomic mass unit & average atomic mass. Calculate average atomic mass & isotopic abundance.