Sept. 30 – The Atom

Learning Goals: Understand what makes the atoms of one element different from the atoms of another.

Success Criteria: You can use a periodic table to figure out how many protons, neutrons and electrons there are in an atom of each element.

Listen to these songs:

Old Periodic Table Song: http://www.youtube.com/watch?v=GFIvXVMbII0 
New Periodic Table Song: http://www.youtube.com/watch?v=zUDDiWtFtEM

You will not be required to remember the period table, but you will go a long ways if you can remember the first 20.

I also handed back the Density Lab.  Here are some general notes on common errors that people made.

• Put the variables you control in order.
• In a data table: only write units once.
• On graphs, label axes and add a GOOD title.
• Calculations: Always show your work.
• Write out formulas before using numbers.
• Include UNITS in your slope.

Here are some note from today:

Notes on the Atom

What makes the atoms of one element different from the atoms of another?

All atoms are made up of: electrons, protons and neutrons.

Each element has a different number of protons.

• The number of protons determines the element.
• The number of protons is called the Atomic Number.

Name	Charge	Mass (amu)	Location
proton	+	1	In the nucleus
neutron	No charge	1	In the nucleus
electrons	–	Very small	around the nucleus

Examples of how to find neutrons.

How many neutrons are in Ne (neon)?

Atomic number: 10

Atomic mass: 20.18 rounded to 20

Number of neutrons:  20 – 10 = 10

How many neutrons are in Fe (iron)?

Atomic number: 26

Atomic mass: 55.85 rounded to 56

Number of neutrons: 56 – 26 = 30

How many neutrons are in Ag (silver)?

Atomic number: 47

Atomic mass: 108

Number of neutrons: 108 – 47 = 61

Handouts: Atomic Mass and Number

No homework for today except reading chapter 6.7.