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# The Atom &amp; the Periodic Table

The Atom &amp; the Periodic Table. Jen Rosenthal. Review of the Atom. Fill in the following table based on what you learned from last class about the atom. History of the Periodic Table Dmitri Mendeleev. Searched for way to organize elements Put them in order of increasing masses.

## The Atom &amp; the Periodic Table

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### Presentation Transcript

1. The Atom & the Periodic Table Jen Rosenthal

2. Review of the Atom Fill in the following table based on what you learned from last class about the atom.

3. History of the Periodic TableDmitri Mendeleev • Searched for way to organize elements • Put them in order of increasing masses

4. How do you read the periodic table?

5. Parts of the Periodic Table

6. What you need to know http://www.classzone.com/books/earth_science/terc/content/investigations/es0501/es0501page06.cfm

7. Key Terms to Understand

8. Atomic Calculations # of electrons = atomic number Ex: Magnesium (Mg) has _12__ electrons # of protons = atomic number Ex: Sodium (Na) has _11_ protons # of neutrons = mass number (atomic mass rounded to nearest whole number) – atomic number Ex: Tin (Sn) has _69____ neutrons

9. Atomic Weight, Molecular Weight, & Formula Weight Atomic Weight- comes from the Periodic Table & is a measure of the average mass of the isotopes of the element Molecular Weight- is the mass of a molecular compound (water) Ex: H20 = 2 Hydrogen atoms = 2 x 1.01 = 2.02 1 Oxygen atom = 1 x 15.99= 15.99 Molecular Weight of water = 18.01 amu Formula Weight- is the mass of an ionic compound (salt) Ex: NaCl = 1 sodium atom = 22.99 1 chlorine atom = 35.45 Formula weight of salt = 58.44 amu

10. Understanding the Periodic Table Orbitals (n =2) two electrons can fit inside of one orbital Sublevels (s,p,d,f) Where s = 1, p = 3, d = 5, f = 7 Energy Levels Relates directly to # of horizontal periods in the Periodic Table (1 to 7)

11. Atomic Apartment Building Think of the apartments as only being able to hold two people per room & has 7 floors. Apartment Type # of rooms # of people s 1 2 p 3 6 d 5 10 f 7 14 1 1s 2 2s 1s 2p 3p 3 3s 4p 3d 4 4s 5p 4d 5s 5 6p 5d 6d 6s 6 7 7s

12. Sublevels Electron orbital designated as s,p,d,&f

13. More Terms to understand bonding

14. Activity 1: Understanding Periodic Trends Instructions: Working in groups look at the following charts which show periodic trends for: • Atomic radii (atomic size) • Ionization energy (the measure of energy required to remove electrons from an atom) • Electron Affinity (the measure of attraction between incoming electrons from other atoms and the nucleus of original atom) Describe what you notice about the charts and what you think they mean. Write your thoughts in your science journal.