ASRJC 1. Atomic Structure

2023 JC1 H2 Atomic Structure 2023nderson Serangoon JC/Chemistry 1 /A Anderson Serangoon Junior College H2 Chemistry ATOMIC STRUCTURE Content 1. The nucleus of the atom: neutrons and protons, isotopes, proton and nucleon numbers 2. Electrons: electronic energy levels, ionisation energies, atomic orbitals, extranuclear structure Learning Outcomes Students should be able to: (a) identify and describe protons, neutrons and electrons in terms of their relative charges and relative masses (b) deduce the behaviour of beams of protons, neutrons and electrons in an electric field (c) describe the distribution of mass and charges within an atom (d) deduce the numbers of protons, neutrons and electrons present in both atoms and ions given proton and nucleon numbers (and charge) (e) (i) describe the contribution of protons and neutrons to atomic nuclei in terms of proton number and nucleon number (ii) distinguish between isotopes on the basis of different numbers of neutrons present (f) describe the number and relative energies of the s, p and d orbitals for the principal quantum numbers 1, 2 and 3 and also the 4s and 4p orbitals (g) describe the shapes of s, p and d orbitals (h) state the electronic configuration of atoms and ions given the proton number (and charge) (i) (i) explain the factors influencing the ionisation energies of elements (see the ) Data Booklet (ii) explain the trends and variations in ionisation energies across a period and down a Group of the Periodic Table (see lecture) The Periodic Table(j) deduce the electronic configurations of elements from successive ionisation energy data (k) interpret successive ionisation energy data of an element in terms of the position of that element within the Periodic Table References 1. Chemistry the Central Science (8th edition). Brown, LeMay, Bursten 2. Alevel Chemistry. E.N Ramsden –3. Understanding Advanced Physical Inorganic Chemistry. Jeanne Tan, Chan Kim Seng 4. Chemistry for Advanced Level. Peter CannPeter Hughes , 5. Cambridge International AS and A Level Chemistry. Lawrie Ryan and Roger Norris Additional Activities Learning Packages – on SLS 1. Protons, Neutrons and Electrons 2. Energy Levels of Orbitals in an Atom 3. Representing Electronic Configuration4. Ionisation Energy

2023 JC1 H2 Atomic Structure 2023nderson Serangoon JC/Chemistry 2 /A INTRODUCTION How has the understanding of atomic structure developed and evolved?  The atomic model has changed over timenew evidence surfaced when through the various discoveries relating to the structure of an atom. http://bit.ly/1NT65ai Source: https://www.tes.com/lessons/e_Cw_QvqG1a9w/atomicstructure – – From John Dalton’s atomic theory, the development of atomic theory had come a long way and our understanding of the nature of matter and the structure of atoms were deepened with the works of scientists such as J. J. Thompson, Ernest Rutherford, James Chadwick, Niels Bohr, Louis de Broglie, Erwin Schrödinger and We