Chemistry MCQ Test 1

Chemistry MCQ Test 1

1. Electrons

   • Electrons are always moving
     • The movement of the electrons will depend on the amount of energy of energy
   • If an electron shell is not full, it will cause a chemical reaction and will cause the atom to bond with another atom to get a full outer shell
     • The chemical reaction could lead to the loss or gain of electrons
     • Ionic Bonding
     • Covalent Bonding
   • When the distance between the electron shell and the nucleus of an atom increases, the bigger the electron shell will be
     • More electrons can be held

2. Electron / Valence Shell

   • The elements that are in the same group in the periodic table will have a similar electron configuration in their outer shells
   • The Valence Shell will have similar properties
   • This will depend on the reactivity of the atoms

3. Octet Rule

   • The unfilled electron shells will cause a chemical reactions
   • The main group elements will tend to undergo a reaction that leaves them with eight valence shells.
   • Need 8 electrons in the electron shells like the 8th group
     • Helium, etc