Do Now. What are valence electrons?
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1 Do Now What are valence electrons?
2 Bonding
3 Think of an atom as a HOTEL the front desk is the nucleus. Each room can hold a maximum of 2 electron guests, or a total of 8 electrons per floor. Except the first floor which only has 1 room. Each floor is like the areas where electrons would be found each floor can have a maximum of 4 rooms.
4 Atomic stability When the highest energy levels (floors) of atoms are filled with e -, the atoms are said to be stable (unlikely to react). Each level contains up to 4 orbitals (rooms) with 2 e - in each orbital, or a total of 8 e - maximum. How many e - do these elements need in order to become stable?
5 2 8 8 Rule 1. The first energy level contains a maximum of 2 electrons and must be completely filled before electrons can move into the next energy level. 2. The second energy level contains a maximum of 8 electrons and must be completely filled before electrons can move into the next energy level. 3. The third energy level contains a maximum of 8 electrons also.
6 2-8-8 Rule: The 1st energy level in an atom can hold a maximum of 2 electrons. The next 2 levels can hold a maximum of 8 electrons. Atoms become stable only when energy levels are completely filled.
7 Ionic Bonds When an atom loses an electron, it loses a negative charge and become a positive ion (cation). When an atom gains an electron, it gains a negative charge and becomes a negative ion (anion).
8 Definitions: 1. Chemical bond: the force that holds ions together. 2. Ionic bond: Forms when electrons are transferred from one atom to another. One of the atoms must be a metal. 3. Chemical formula: the notation that shows what elements are contained in a compound and how many atoms of each element are present. Answer #13 as closure.
9 Do Now What is the Rule?
10 Look at your copy of the Periodic Table: 1. How many e - do Group 7A elements need to become stable? 2. How many e - do Group 6A elements need to become stable? 3. How many e - do Group 1A have available to transfer? 4. How many e - do Group 2A have available to transfer?
11 What happens at the atomic level when sodium atoms reacts with chlorine atoms?
12 Forming Ionic Compounds: Practice (#15 in your notes) 1. Using valence electrons, how can you combine magnesium and chlorine? 2. Using valence electrons, how can you combine carbon and hydrogen?
13 Electron Dot Diagrams These diagrams represent the number of valance electrons in atoms and show how they are transferred from the metal to the nonmetal, creating the IONIC bond. The metal becomes the positive side (it loses electrons) and the non-metal becomes the negative side (it gains electrons).
14 Every element can be drawn as an electron dot diagram. Remember to add electrons to all 4 orbitals, one at a time, before adding a second electron to any orbital.
15 Put it all together! 1 Oxygen has an atomic number of 8 (protons) and, therefore, a total of 8 electrons. 5 Valence electrons are the number of electrons occupying an unfilled energy level. Valence electrons are available for bonding. 4 Each energy level contains 4 orbitals with the possibility of 2 electrons per orbital. You must place 1 electron in each orbital before placing a 2 nd. 2 Oxygen has 2 electrons in the 1 st energy level, leaving 6 remaining from its total of 8. 3 The 2 nd energy level can contain a maximum of 8 electrons (2 8 8 ), but oxygen only has 6 available to fill this level.
16 Electron Dot Diagram - Practice Use the handout to practice drawing electron dot diagrams for some common elements. Work with a partner and we will discuss your diagrams as a class.
17 Closure: How do you know how many valence electrons an element has on the periodic table?
18 Do Now What is an Ionic Bond? (Complete the 1 st row on the chart)
19 Bohr Model Practice Use the space provided under Notes #18 and practice drawing Bohr Models (rings around a nucleus that are filled with electrons) for the 4 atoms. FOLLOW THE RULE
20 Covalent Bonds Covalent bonds are those that hold nonmetal elements together. In covalent bonds, electrons are shared between atoms, not transferred, as in an ionic bond.
21
22 How Covalent Bonds Form The force that holds atoms together in a covalent bond is the attraction between the shared pair of electrons. This is one SINGLE COVALENT bond.
23 How Covalent Bonds Form The nitrogen atom in ammonia is surrounded by eight electrons as a result of sharing electrons with hydrogen atoms. There are 3 SINGLE COVALENT bonds
24 Double and Triple Covalent Bonds Each oxygen atom has 6 valence electrons (Group 6A). When they bond together, they share 2 electrons with each other forming a shared DOUBLE BOND. Each nitrogen atom has 5 valence electrons (Group 5A). When they bond together, they share 3 electrons with each other forming a shared TRIPLE BOND.
25 Metallic Bonding A metal crystal consists of positively charged metal ions embedded in a sea of valence electrons.
26 Metallic Bonding
27 Closure: What happens to the electrons when two non-metal atoms come together?
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