- 100 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Practice Quiz' - darius-mcdonald

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Zinc _____

Bromine _____

Sodium _____

Flourine _____

Gold _____

Copper _____

Nickel _____

9. Ca __________

10. C __________

Mg __________

Hg __________

Zn __________

Cl __________

K __________

Sn __________

Practice QuizProtons

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

- Ordered by the number of protons

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

- The same as calculating your grade

Let’s Practice

- Calculate the atomic mass
107Ag 106.905 amu 52%

109Ag 108.905 amu 48%

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

- 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%

Download Presentation

Connecting to Server..