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DAY 5 Chapter 4 Section 2 and 3

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CHECK Identify the following to fill in the chart. 1. Name of element 2. # of Protons 3. Average Atomic Mass

TRANSCRIPT

DAY 5Chapter 4 Section 2 and 3

HOW ATOMS DIFFERStart with some Vocab• Atomic Number

• Atoms total # of Protons

• Atoms Total # of Electrons

Note: as long as the atom is neutral in charge

• Atomic # identifies an atom of a particular element.• It never changes

How to read the Periodic Table

Page 3: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

CHECK• Identify the following to fill in the chart.1. Name of element2. # of Protons3. Average Atomic Mass

Page 4: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

ATOMIC NUMBERSComplete the following tableComposition of Several Elements

Element Atomic Number Protons Electro

nsa. Pb 82b. 8c. 30

82 82

Zn 30 308 8O

Page 5: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

ISOTOPES AND MASS NUMBER• What do we know…?• Does the # of protons of

an element ever Change?• NO

• Does the # of electrons of an element ever change?• NO

• What’s Left?• # of Neutrons will

change

• What does this mean?

Atoms with the same number of protons but

different number of neutrons are called

isotopes.

Page 6: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

THE MASS NUMBERSo…The Mass Number is…(Atomic #) + (# of neutrons)

What makes up the mass number of an isotope.• Remember Relative

Mass• Protons = 1amu• Neutrons = 1amuWhat’s this mean? • If an element has 1

proton and 1 neutron what's the Mass Number?• 2

Page 7: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

WHAT DOES ALL THIS MEAN?Elements have different forms in nature• Lets look at Copper…• How many protons in Copper?

• 29 protons• Does this ever change?

No• But copper has two forms with different mass

numbers.• What changes…# of Protons or # of Neutrons?

# of neutrons

Page 8: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

COPPER - ISOTOPESCopper – 63Copper - 65Other ways to write it

Mass number

Cu65

29Cu63

Other ways to write it

Page 9: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

LEARNING CHECK• 1st… J.J. Thomson• The Plum pudding Model…didn’t last long• We know…Atoms are neutral / no charge (positives

cancel negatives)• Proposed…Uniformly (evenly) distributed positive and

negative charges.

Page 10: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

NATURAL ABUNDANCE• % abundance

Page 11: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

LET’S PROVE THE NUCLEUS• Didn’t happen…• The alpha particles (positive charge) bounced all over

the place…Why?

Page 12: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

LET’S PROVE THE NUCLEUS• The Protons have a positive charge…repelled the

positive alpha particle• The neutron has no charge doesn’t effect it.

Page 13: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

THE MASS OF THE ATOM

What does relative mean?• Comparative / in proportion to

something• So…whats

1.67x10-27

1.67x10-27= 1 (relative)

Page 14: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

THE MASS OF THE ATOM

What does relative mean?• Comparative / in proportion to

something

Page 15: DAY 5 Chapter 4 Section 2 and 3. HOW ATOMS DIFFER Start with some Vocab Atomic Number Atoms total # of Protons Atoms Total # of Electrons Note: as long

ONE LAST NOTE

• Quarks? And plasm?• Parts that make up

Protons and neutrons• Scientists don’t know

their effect on chemical behavior

HOMEWORK ASSIGNMENT• Moodle Assignment

Day 5

A LOOK AHEAD• Day 6: Isotope Lab /

• Quiz on the Atom• Day 7: Chapter 4 Section

¾• Day 8: Isotopes Quiz:

• Chapter 24 Section 1• Day 9: Chapter 24

Section 2

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