Chapter 12.1

Standards: GLE GLE GLE

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 NO PP EN What is a valence electron? Where do we find valence electrons?

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. 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? Questions on Page 313 – #2-7 Any questions about your t-shirt design?