2017/18, Mrs. Manning-Benson, Mr. Blaurock
Preparation checklist for Term Test 1, Year 9 Chemistry
a) Atomic structure
worksheet 6
o Name the origin and translation of the term “atom”
o Explain the difference between the terms “atom” and “element”
o Be able to describe the general structure of an atom
o Name the general properties of protons, neutrons and electrons (location in the atom, mass, charge)
o Be able to read the entries into the periodic table and derive the number of electrons, protons and neutrons in an atom
o Be able to explain why some elements have non-integer masses (e.g. 35,5 for chlorine as opposed to 16 for oxygen), you DON’T have to be able to calculate the average masses yourselves
o Define the term isotope and explain the difference when given an example, e.g. 238U and 235U
o NOT NECESSARY: discovery of the atom (Dalton, Rutherford, Bohr, …), learning all element names by heart (you will be given the element symbols)
b) Electron configuration
Worksheet 8
o Describe the electrons around an atomic nucleus as ordered in discrete (=separate) energy levels that are themselves split up into (usually four) orbitals
o Define orbitals as areas in which up to two electrons can be found
o Be able to construct an orbital model for all elements of the first three periods (rows) of the periodic table
DO NOT learn the Pauli exclusion principle or Hund’s rule by heart, but get used to applying them when drawing the orbital model
o Transform the orbital model into a simplified orbital model and a Lewis notation for every element of the first three periods
o Write a shorthand electron configuration for every element from the first three periods, e.g. [2,6] for oxygen (O)
o Define the term valence electron and valence energy level
o NOT NECESSARY: Ionization energies and the theory behind them (worksheet 7)
c) Ionic compounds
Worksheets 9 and 10
o The octet rule and the reason for atomic bonding
o Forming anions and cations using the orbital model and electron configurations o Deriving the ratio and formula of an ionic compound formed by any combination of
main group elements
