Provide definitions for atoms, elements, periodic table, and sub-atomic particles, and describe the charges and arrangements of sub-atomic particles in an atom.

Here are the solutions to the questions: Activity 1 - Atoms and sub-atomic particles 1.1 1.1.1 The tiny particles all matter is made up of: Atoms 1.1.2 A substance (material) that is made up of atoms of the same kind: Element 1.1.3 The organised arrangement of all the known elements: Periodic Table 1.1.4 A substance that cannot be broken down into simpler substances: Element 1.1.5 Particles, such as protons, neutrons and electrons found in an atom: Sub-atomic particles 1.2 a) The three sub-atomic particles are: Protons Neutrons Electrons b) The charge of each particle: Proton: +1 Neutron: 0 (neutral) Electron: -1 1.3 To draw a fluorine atom with 9 protons, 10 neutrons, and 9 electrons: Draw a central nucleus containing 9 protons (labeled 'p+') and 10 neutrons (labeled 'n'). Draw two electron shells around the nucleus. Place 2 electrons in the first shell. Place 7 electrons in the second shell. Label the nucleus and the electron shells. Activity 2 - Pure substances (Elements and Compounds); Mixtures 2.1 Here are the models for the molecules: 2.1.1 H₂: Two small circles (representing Hydrogen atoms) joined together. O—O 2.1.2 O₂: Two large empty circles (representing Oxygen atoms) joined together. ◯—◯ 2.1.3 N₂: Two striped circles (representing Nitrogen atoms) joined together. ☰—☰ 2.1.4 H₂O: One large empty circle (Oxygen) bonded to two small circles (Hydrogen). The molecule has a bent shape. O \\ / \\ \\ O O 2.1.5 CO₂: One solid black circle (Carbon) bonded to two large empty circles (Oxygen). The molecule has a linear shape. ◯—●—◯ What's next? Send 'em! 📸