C4

C4

1. Element is something made up of one type of atoms. Compound is two or more elements chemically bounded.

   • atoms contain 3 subatomic particles : electrons neutrons and protons
     • Electrons charge is -1 and relative mass of 0.0005
     • Protons have a charge of 1 and relative mas of 1
     • Neutrons has a charge of 0 and a relative mass of 1

2. Scientist

   • John Dalton suggested every is made up of atoms and atoms cant be made or destroyed
     • J.J Thomas discovered electrons
       • Ernest Rutherford discovered atom is mainly empty space with electrons arranged around the nucleus
         • Neils calculated that electrons obrit or move around the shells nucleus

3. Isotopes varietes of element that have the same atomic number but different massnumbers

4. Ions a charged particle

   • Either positive charged or negative charged
   • If we lose an electron it is positive if we gain an electron it is negative

5. covalent bonds : non metals join together to form covalent compounds. a covalent bond is shared pair of electrons

   • element only one type of atom
   • Molecule two or more atoms chemically bonded together
   • compound two or more different elements chemically bonded together
   • Carbon dioxide is gas in room temperature
     • water is liquid at room temperature
       • low melting points and both don't conduct electricity