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.

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Presentation transcript:

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.Quiz 2.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?

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!

Stable

Ionic Bonds A covalent bond forms when atoms share a pair of electrons. Ionic bonds form between oppositely charged ions. Sodium atom (Na)Chlorine atom (CI)Sodium ion (Na + )Chloride ion (CI - ) Na loses an electron to CI ionic bond gained electron

Covalent Bonds covalent bonds Oxygen atom (O)Carbon atom (C)Oxygen atom (O) Carbon dioxide (CO 2 ) A covalent bond forms when atoms share a pair of electrons.