Practice Quiz

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# Practice Quiz - PowerPoint PPT Presentation

Aluminum _____ Zinc _____ Bromine _____ Sodium _____ Flourine _____ Gold _____ Copper _____ Nickel _____. 9. Ca __________ 10. C __________ Mg __________ Hg __________ Zn __________ Cl __________ K __________ Sn __________. Practice Quiz. Atomic Number

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Presentation Transcript
Aluminum _____

Zinc _____

Bromine _____

Sodium _____

Flourine _____

Gold _____

Copper _____

Nickel _____

9. Ca __________

10. C __________

Mg __________

Hg __________

Zn __________

Cl __________

K __________

Sn __________

Practice Quiz
Atomic Number

Protons

Electrons (for now)

Atomic Mass

Protons + Neutrons

9

F

19.0

• Neutrons = atomic mass – atomic number
• Periods/Energy levels are rows that go across
• Families/Groups columns that go up & down
• Electrons in outer energy level – same as column
How Atoms Differ
• Periodic Table
• Ordered by the number of protons
• the only thing about an atom that doesn’t change!
• If you change proton number you change the element
Mass of Individual Atom
• Mass of proton or neutron = 1.67 x 10-24 g
• Mass of electron = 9.08 x 10-28 g

or 1/1840 the mass of proton

• Atomic Mass = weighted average of the isotopes of an element
How to calculate Atomic Mass
Let’s Practice
• Calculate the atomic mass

107Ag 106.905 amu 52%

109Ag 108.905 amu 48%

Let’s Practice

2. Calculate the atomic mass

1H 12%

2H 48%

3H 40%

Let’s Practice

3. Boron has two naturally occurring isotopes, boron-10 (abundance 19.8%, mass 10.013 amu) boron-11 (abundance 80.2%, mass=11.009 amu)

Calculate the average atomic mass

Let’s Practice

4. Calculate the average atomic mass

12C 12.0014 amu 87.3%

14 C 13.9960 amu 12.7%

Let’s Practice
• Calculate the average atomic mass

Iron-55 67.8%

Iron-58 32.2%

Let’s Practice

6. Calculate the atomic mass

Helium has two naturally occurring isotopes, helium-3 and helium-4. The average abundance of helium-3 is 27.2%, and the average abundance of helium-4 is 72.8%