PPT-Atomic Structure Unit 3 What is an Atom?

httpsyoutube 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 . Atomos: Not to Be Cut. The History of . the Atom and the Atomic . Theory. Atomic Models. This model of the atom may look familiar to you. This is . the Bohr model. . In this model, the nucleus is orbited by electrons, which are in different energy levels. . Chemistry. Learning Goals . To be able to . explain and draw atomic structure. Elements. Elements are the . building blocks. of all . matter. on Earth. Elements are made up of . atoms. Differences in . On your bell work . sheet, answer the following.. When . are zeros significant? . . When . do you use the fewest number of Significant Figures?. Objectives. The Structure of the Atom. Properties of Subatomic Particles. Textbook Pages 4-5. Lesson Objectives. Appreciate that there are various models to illustrate atomic structure. Know that early models of atomic structure predicted that atoms and ions with noble gas electron arrangements should be stable. Chapter 1D. Warm Up November . 28. What is smaller, an atom or a cell? . Name and describe one element that you are familiar with on the periodic table. . When large blooms of algae die, decomposers use all the oxygen in the water to break down the dead algae. What is this a result of? . What are the 3 major parts of an atom?. Proton . Neutron . Electron. Parts of an Atom. Another Model. SIMPLIFIED MODEL.. PROTON. Protons are positively charged particles found in the atomic nucleus. . 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.. Atoms are the fundamental blocks of matter…. Chapter Big Idea. Section 1: Early Ideas About Matter. What are the similarities and differences of the atomic models of Democritus, Aristotle, and Dalton?. Matter describes anything that has . mass. and . volume. Can matter be invisible? . YES. Ex. . Air. Matter and Atoms. History of atoms. Democritus. Was a . Greek. philosopher in . 400 BC. Thought the universe was made of . Chemistry. Basics of the Atom . Subatomic. Particle. Charge. Location in. the Atom. Mass. a.m.u.. : unit used to measure mass of atoms. “atomic mass unit”. proton. neutron. electron. 1 . 0. 1–. Structure Of An Atom. Parts. Found in Nucleus. Protons . Neutrons. Found in shells or orbits. Electrons. Protons. Found . in. the . nucleus. Positively. charged. Determines. the . identity. -The nucleus is at the centre of the atom and contains the protons and neutrons. Protons and neutrons are collectively known as . nucleons.. The sub-atomic particles:. Protons. are positively charged . Rutherford proposed that most of the mass of the atom was concentrated. . at the atom’s center. . Rutherford’s Model of the Atom. Rutherford’s experiment suggested that an atom’s positive charge is concentrated in the center of the atom . Elements, Mixtures and Compounds. Atoms and molecules. Remember that an . element . is one type of atom, like carbon, gold or chlorine. We will look at three ways that atoms can exist.. 1. Single atoms.