atom notes pre-test (answer at the top of your paper) 1. how many protons, neutrons, & electrons...

Atom Notes

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Atom Notes

Pre-test (answer at the top of your paper)

1. How many protons, neutrons, & electrons does Magnesium have?

2. What is the Atomic Number of Aluminum?

3. What is the Mass Number of Uranium?

4. What is an Isotope?5. What is an Ion?

Page 3: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

What is in an atom?The Three Primary

Subatomic Particles... Protons Neutrons Electrons

Page 4: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Which Particle is Where?

Nucleus• Protons• Neutrons

Electron clouds – Swarm around the

nucleus like bees– Not in nice clear

orbitals

Page 5: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Protons are the identity.

# of protons = the atomic number Atomic number = # of protons # of protons determines which element

it is! What is element # 15? How many protons does lithium have? What is the atomic number of tin?

Page 6: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Neutrons provide mass.

Number of neutrons can vary, even for the same element.

Isotopes – same # of protons – different # of neutrons

Elements have many different isotopes– Carbon-14, Uranium-238

Neutrons affect the atomic mass

Page 7: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Atomic Mass

Sum of the protons and neutrons

Electrons are not included– Too small

What is the atomic mass of this atom?

Page 8: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

What about the electrons? A neutral atom has

no charge. positive charges =

negative charges. A neutral atom has

the same # of electrons as protons

How many electrons does this atom have?

Page 9: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

What if the atom isn’t neutral? If an atom is not

neutral, then it has a charge.

Ion – Charge particle

This atom has:

3 protons (+++)

2 electrons (--) It is written as Li+

Page 10: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Your Periodic Table has the answers

How many protons? How many neutrons? How many electrons (if the atom is neutral?)

Page 11: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

SUMMING UP… How many protons?

– The atomic number How many neutrons?

– Atomic mass minus atomic number How many electrons (if the atom is neutral?)

– Same as # of protons

Page 12: Atom Notes Pre-test (answer at the top of your paper) 1. How many protons, neutrons, & electrons does Magnesium have? 2. What is the Atomic Number of

Make sure you have these definitions in your notes!!

Ion: Isotope: Atomic number: Atomic mass:

Post-test (complete the Pre-test)

1. How many protons, neutrons, & electrons does Magnesium have?

2. What is the Atomic Number of Aluminum?

3. What is the Mass Number of Uranium?

4. What is an Isotope?5. What is an Ion?

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