Atoms!

Schwichtenberg

DO NOW

• Get out your graphing homework• A student tests the amount of carbon found in

the soil of 3 different types of plants and the soil without any plants. List the:– Independent variable– Dependent variable– Control Group– Hypothesis

DO NOW

• Get out your atom tutorial handout & your atom notes sheet

• Draw a picture with labels of an atom. Include this vocabulary: – Nucleus– Neutron– Proton– Electron

TASKS

1. Quiz2. Complete graph (follow the steps from your

notes!)3. Complete: A look Inside the Atom online

activity (see handout and website)Schwichtenberg.wikispaces.com/home

What is an atom?

What is an atom?

An atom is the smallest basic unit of matter

Structure of an atom

Structure of an Atom

So, how big is an Atom?

So, how big is an atom?!

A substance made up of the same type of atom is an_______________.

What is a Molecule?

A group of atoms bonded together

Bond: A strong force of attraction

holding atoms together in a

molecule

PRACTICE!

Using the periodic table

How is the periodic table organized?Periods: (Rows) Shows the number of energy levels

Groups: (Columns) All elements in a group have the same number of valence electrons. Elements in the same group share the same properties – do the same “things”

Valence electrons: the number of electrons in the outer shell of an atom

How do we represent atoms on paper?

How to make a Bohr model: 1. Draw a circle to represent the nucleus of the atom.

How do we represent atoms on paper?

2. Add more circles outside the nucleus to represent energy levels (electron shells).

How do we represent atoms on paper?

3. Add electrons (as small dots) to each energy level as allowed until you have the proper number of electrons for a neutral element. (# of electrons should be = to the number of protons).

REMEMBER!

DO NOW

1. Get out your calendar2. Get out your atom homework3. Draw a picture of an aluminum

atom.

StableAtoms are stable when their outer energy levels are full.

Ionic Bonds• Ionic bonds form when atoms lose or gain electrons.

Sodium atom (Na) Chlorine atom (CI) Sodium ion (Na+) Chloride ion (CI-)

Na loses anelectron to CI ionic bond

gained electron

Covalent Bonds

covalent bonds

Oxygen atom (O) Carbon atom (C) Oxygen atom (O)

Carbon dioxide (CO2 )

A covalent bond forms when atoms share a pair of electrons.

Lewis Dot Structures (electron diagrams)

1.Write the chemical symbol 2.Draw the valence electrons

around the chemical symbol. **There must be at least one electron on each side before doubling up!