Warm up

• Why are hydrogen bonds the weakest bond, ionic bonds stronger, and covalent bonds the strongest?

• What does it mean to be the strongest bond?

Matter

• Everything in our universe is made of stuff, tiny atoms and molecules

• Particles attract one another, the greater the attraction the closer the particles get

Atoms

Elements, molecules and compunds

• Element-A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus

• Molecule- two or more atoms chemically combined

• Compounds- Two or more DIFFERENT elements chemically combined

Write down one element, two molecules(same element, different element) and one compound

Bonds

• A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms

• Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions

• A hydrogen bond is the attractive force between the hydrogen attached to an electronegative atom of one molecule Usually the electronegative atom is oxygen, nitrogen, or fluorine, which has a partial negative charge.

Periodic Table

Valence Electrons and Shells

• Valence electron in the outermost electron shell

• They can participate in the formation of a chemical bond; The presence of valence electrons can determine the element's chemical properties and whether it may bond with other elements

• Electron shell,  may be thought of as an orbit followed by electrons around an atom's nucleus

KCl is a common compound, why do Potassium and Chlorine go so well together?

Lewis Structure/ Electron Dot Diagram

• Diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule

Draw out the EDD for Li, F, Phosphorus