objectives: swbat: identify and describe the formation of ionic bonds

Objectives: SWBAT: Identify and describe the formation of ionic bonds.

SWBAT: Predict the charged ion an atom will form. Bellringer: Draw the Lewis Dot Structure for

Fluorine, Phosphorus, Beryllium

Types of Bonds

Valence Electron GameDirections: • Compete against your table partner

• Goal: Be the first to circle the correct number of valence electrons for a given atom.

•On the following slides are elements. When we click on the slide, circle the number on your scorecard that corresponds to the number of valence electrons in the element.

O6

Be2

F7

C4

Li1

Ne8

B3

+ =

Na Cl NaCl

Compounds

• A compound is a pure substance made up of two or more elements in which the elements are chemically combined

Chemical Bond = the attraction that holds atoms together

Why do atoms bond?

Atoms bond in order to become stable (fill their outer shell)

Octet Rule

• All atoms want to become super stable, awesome, Noble gasses!

• In other words, all atoms want 8 valence electrons.

Types of Chemical Bonds1) Ionic bond = electrons are

TRANSFERRED between atoms

Occurs between metal and nonmetal

Types of Chemical Bonds2) Covalent bond = electrons are

SHARED between atoms

Occurs between nonmetal and nonmetal

Ion = charged atom

Ca+ions are posi+ive

Anions are negative

Ionic Bonds

• Sodium has one valence electron it wants to lose• Chlorine has 7 valence electrons, so it wants to

gain one more to make it to eight.

·Na Cl ::·

:

Ionic Bonds

• The Sodium atom donates its one valence electron to Chlorine.

·Na Cl ::·

:

Ionic Bonds

• Now, both atoms have a full outer electron cloud.• Na is now positively charged = cation (+1 because it now

has 1 more PROTON than electrons)• Cl is now negatively charged = anion (-1 because it now

has 1 more ELECTRON than protons)• The 2 atoms are held together by the electrostatic

attractions (think of magnets!)

·Na+1 Cl-1 ::

·

:

Ionic Bonds

• Sodium and Chloride are now ionically bonded to form a new compound known as sodium chloride (NaCl).

• This is known to most of us as Table Salt.

Na Cl ::

::

Ionic Bonds• Chat Chum practice- – Group work- Level 2- Raise hand for help!

• Draw the Lewis Dot Structure for • K • Cl

• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence

electrons• Show the CHARGE on the atoms (which is the

cation and which is the anion)• Draw the bonded molecule!

Ionic Bonds• Chat Chum practice-

– Group work- Level 2- Raise hand for help!

• Draw the Lewis Dot Structure for • Li• Br

• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence electrons• Show the CHARGE on the atoms (which is the cation and

which is the anion)• Draw the bonded molecule!

Ionic Bonds

• Who wants to draw their process on the board?

Challenge Problem!• Individual Practice-– Level 0/Level 1 if you need help- Ask Chat Chum first,

then raise hand!

• Draw the Lewis Dot Structure for – Mg– O

• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence

electrons• Show the CHARGE on the atoms (which is the cation

and which is the anion? )• Draw the bonded molecule!

Homework!

• Practice: Ionic Bonding