1. Chapter 12, section 1 Electrons and Chemical Bonding

2. Write the question and answer!
Bell Work Plickers
1. When elements form mixtures, the elements
keep their original properties.
react to form a new substance with new properties.
combine in a specific mass ratio.
always change their physical state.
Write the question and answer!

3. Student Learning Objectives:
SPI Recognize that all matter consists of atoms.
SPI Differentiate between a mixture and a compound.
SPI Use the periodic table to determine the properties of an element.
Describe chemical bonding.
Identify the number of valence electrons in an atom.
TOC:
#63. Ch 12, section 1 Notes
#64. Valence Electrons
HW: Thursday- Element #11-20 Quiz
Friday- Word Wall Crossword Puzzle due

4. Element Quiz #2 on Thursday!
You need to know the Element Name, Symbol, and Atomic # for Elements

5. Electrons and Chemical Bonding
Cool Link!

6. Chemical bonding is the joining of atoms to form new substances.
An interaction that holds two atoms together is called a chemical bond. When chemical bonds form, electrons are shared or transferred.

7. The number of electrons in an atom can be determined from the atomic number of the element.
Electrons in an atom are organized in energy levels: st – 2; 2nd – 8; 3rd – 18.

8. Valence electrons are the number of electrons on the outermost (last) energy level
You can use the periodic table to determine the number of valence electrons for atoms of some elements

10. The number of electrons in the valence level of an atom determine whether an atom will form bonds.
Atoms that have 8 electrons in their valence level do not usually form bonds. The outermost energy level is considered to be full if it contains 8 electrons.

11. An atom that has fewer than 8 valence electrons is more likely to form bonds than an atom that has 8 valence electrons. Atoms bond by gaining & losing electrons or sharing electrons to have a filled outermost energy level.

12. Move around the room!

13. Show Time! 1. Which of the following atoms do not usually form bonds?
Calcium
Neon
Hydrogen
Oxygen
2. When bonding occurs, the joining of two atoms will form a _______ _____________.
3. How can an atom that has 5 valence electrons achieve a full set of valence electrons?
4. Identify the number of valence electrons in a barium atom.
Justify!

14. Check! 1. Which of the following atoms do not usually form bonds?
Calcium
Neon
Hydrogen
Oxygen
2. When bonding occurs, the joining of two atoms will form a new substance.
3. How can an atom that has 5 valence electrons achieve a full set of valence electrons? They will share or gain 3 electrons.
4. Identify the number of valence electrons in a barium atom.
A barium atom has 2 valence electrons.
It’s a noble gas!

15. Valence Electrons Alkali Metals Alkaline Earth Metal Transition Metals
Color each Group:
Group 1 – red
Group 2 – blue
Group 13 – yellow
Group 14 – brown
Group 15 – orange
Group 16 – violet
Group 17 – green
Group 18 – light blue
Label the following groups:
Alkali Metals
Alkaline Earth Metal
Transition Metals
Halogens
Noble Gases

16. Exit Ticket
Look at the model. How many valence electrons are in the Nitrogen atom? Will Nitrogen atoms form bond? Explain.