Chemical Bonding

Chapter 12.1

Standards:

• GLE 0807.9.2• GLE 0807.9.4• GLE 0807.9.6

Key concepts:

• Describe chemical bonding• Identify the number of valence electrons in an

atom• Predict whether an atom is likely to form

bonds

Key Vocabulary:

• Chemical bonding• Chemical bond• Valence electrons

Chemical Bond:

• Chemical bonding is the joining of atoms to form new substances.– Think making compounds.– What do compounds look like?

• Chemical bond is an interactions that holds 2 atoms together.

• This happens when:– Electrons are shared– Electrons are gained– Electrons are lost

What is a compound?

What is a bond?

What part of the atom is in charge of bonds?

Picture time!

Review of Atoms

• How do we determine the number of electrons?

• Remember: atomic number = number of protons– SO protons = electrons because

atoms have NO CHARGE• Where do we find electrons?– On rings/orbitals/shells!

• Valence electrons = electrons on outermost shell

NOPPEN

What is a valence electron?

Where do we find valence electrons?

Picture time!

Picture time!

To Bond or to not Bond…

• Remember that not all elements will bond!– Noble gases do not like to form

chemical bonds because they are completely full!

– REMEMBER RULE OF 8!– Elements are considered full when

they have 8 electrons on the outermost ring.

What is a compound?

What is a bond?

What do periods tell us? What do groups tell us?

Picture time!

Remember bonding occurs when electrons:• Electrons are

shared• Electrons are

gained• Electrons are

lost

Pearls of Wisdom:

• Chemical bonding is the joining of atoms to form new substances. A chemical bond is an interaction that holds two atoms together.

• A valence electron is an electron in the outermost energy level of an atom.

• Most atoms form bonds by gaining, losing, or sharing electrons until they have 8 valence electrons. Atoms of some elements need only 2 electrons to fill their outermost level.

Homework:

• Questions on Page 313– #2-7

• Any questions about your t-shirt design?