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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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Practice Quiz

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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

Let’s Practice

• Calculate the atomic mass

107Ag106.905 amu52%

109Ag108.905 amu48%

Let’s Practice

2. Calculate the atomic mass

1H12%

2H48%

3H40%

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

12C12.0014 amu87.3%

14C13.9960 amu12.7%

Let’s Practice

• Calculate the average atomic mass

Iron-55 67.8%

Iron-5832.2%

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%