2.1 Atoms, Ions, and Molecules
First Five 9/29
1. To the best of your
current knowledge, what is
the definition of:
An atom? An Ion? A
Molecule?
2. Take out your
Characteristics of life wkst.
Even if you do not know,
guess!
Schedule
1.First Five
2.Review Test/ Pre test
3.Atom, Ion, Molecule
notes
4.Skit Preparation
HW: Study Guide 2.1 and
2.2 – Due Tomorrow
GQ: What is the smallest
bit of gold you can have?
2.1 Atoms, Ions, and Molecules
KEY CONCEPT
All living things are based on atoms and their
interactions.
2.1 Atoms, Ions, and Molecules
Living things consist of atoms of different elements.
• An atom is the smallest basic unit of matter.
• An element is one type of atom.
Hydrogen atom (H)
H
Oxygen atom (O)
O
2.1 Atoms, Ions, and Molecules
First Five 9/30
1.Without looking at your
notes; what are the three
particles of an atom and
their charges?
2.Place your study guide
on the TA’s desk.
Schedule
1.First Five
2.Atom, Ion, Molecule
notes Finish
3.Skit Preparation and
Presentation
HW: Study Guide 2.1 and
2.2 – Due Today
All make-up due Friday
10/3
GQ: How are the three
types of bonds different?
2.1 Atoms, Ions, and Molecules
• An atom has a nucleus and electrons.
– The nucleus has protons and neutrons.
– Electrons are in energy levels outside nucleus.
Oxygen atom (O)
Nucleus:
8 protons (+)
8 neutrons
outermost energy level:
6 electrons (-)
inner energy level:
2 electrons (-)
2.1 Atoms, Ions, and Molecules
2.1 Atoms, Ions, and Molecules
• A compound is made of atoms of different elements
bonded together.
– water (H2O)
_
O
H
+
H
+
2.1 Atoms, Ions, and Molecules
• A compound is made of atoms of different elements
bonded together.
– water (H2O)
– carbon dioxide (CO2)
2.1 Atoms, Ions, and Molecules
• A compound is made of atoms of different elements
bonded together.
– water (H2O)
– carbon dioxide (CO2)
– many other carbon-based compounds in living things
2.1 Atoms, Ions, and Molecules
Ions form when atoms gain or lose electrons.
• An ion is an atom that has gained or lost one or more
electrons.
– positive ions
– negative ions
• Ionic bonds form between oppositely charged ions.
gained electron
Na loses an
electron to CI
Sodium atom (Na)
Chlorine atom (CI)
ionic bond
Sodium ion (Na+)
Chloride ion (CI-)
2.1 Atoms, Ions, and Molecules
Atoms share pairs of electrons in covalent bonds.
• A covalent bond forms when atoms share a pair of
electrons.
– multiple covalent bonds
– diatomic molecules
covalent bonds
Oxygen atom (O)
Carbon atom (C)
Carbon dioxide (CO2 )
Oxygen atom (O)
2.1 Atoms, Ions, and Molecules
Hydrogen Bonds are between the hydrogen atoms and
oxygen atoms of two polar molecules
2.1 Atoms, Ions, and Molecules
First Five 10/1
1.Without looking at your
notes; Explain the hydrogen
bond to the best of your
ability.
Schedule
1.First Five/new seats
2.Skit Presentation
3.Water wonders lab
HW: Water wonders Lab –
due Thursday
All make-up due Friday
10/3
GQ: How do the properties
of water affect life?
2.1 Atoms, Ions, and Molecules
First Five 10/2
1.What are the three types
of bonds?
Schedule
1.First Five
2.Water wonders lab
HW: Water wonders Lab –
2.Please get started quickly due Tomorrow
All make-up due tomorrow
as we have just today to
10/3
finish the lab.
GQ: How do the properties
of water affect life?