ATOMS, ELEMENTS AND COMPOUNDS

ATOMS, ELEMENTS AND COMPOUNDS

1. ATOMS

   • PROTONS
     • Both are in the nucleus of the atom
     • Positive charge
   • NEUTRONS
     • No charge
   • ELECTRONS
     • Orbit around the nucleus
     • Negative charge
   • Elements
     • Only has one type of atom
     • Forms naturally
   • Compound
     • Has two or more types of atoms
     • Occurs in covalent and ionic bonding
   • Atomic number
     • Shows how many protons are there in a atom
   • Mass number
     • show how many neutrons and Protons are there in the atom

2. Periodic Table

   • Divided into
     • Metals
       • Transition metals
         • Sonorus, conductors of heat and electricity, dense (more atoms per dm^3),tough, high melting points, shiny
           • and have delocalised electrons
             • Exeption: hydrogen does too
       • Alkali Metals
         • usually malleable and soft, have low melting points
     • Non-metals
       • Noble gases
         • non receive although can be forced f=to react under certain conditions
       • Halogens
         • most receive of non metals (non- alkali metal)
       • Other gases
       • brittle, dull, non-conductive, good insulator
     • Metalloids
       • you will learn about them in IB