module 3

• What is the atomic number?

  The number of protons in an atom's nucleus.
• What is the bohr model?

  It describes an atom as a small dense nucleus with electrons orbiting around the nucleus. This model explains different periodic properties of atoms
• What are cations?

  Positively charged ions
• What is the d-block?

  the part of the periodic table in which the elements have their highest energy electron in a d-orbital. It contains the transition metals.
• What is the electron configuration?


  The arrangement of electrons into orbitals and energy levels around the nucleus of an atom / ion
• What is first ionisation energy?

  The removal of one mole of electrons from one mole of gaseous atom
• What are the factors that affect the first ionisation energy?

  The strength of attraction between the electron and the nucleus

  Nuclear charge

  Atomic radius
• What is a giant covalent lattice?

  A network of atoms bonded by strong covalent bonds
• What are common properties of substances with giant covalent lattices?

  Giant covalent lattices typically insoluble with

  a high melting and boiling point due to the presence of strong covalent bonds. They are also poor electrical conductors as they don’t contain mobile charged particles.
• What is the giant metallic lattice structure?

  The structure of all metals, made up of cations and

  delocalised electrons.
• What are the propeties of giant metallic lattice structure compounds/elements?

  Giant metallic structures are typically insoluble with a high melting and boiling points due to strong electrostatic forces of attraction between cations and electrons
• Why are metals good conductors?

  Metals are good electrical conductors due to the presence of delocalised electrons