Bellwork 8-29-2014

1. List the topic/s you think you are an expert in and could teach someone else:

1. Density (how to calculate and solve)2. Scientists (what they did and found)3. Atomic structure (bohr models, P+, No, e-)4. Isotopes (symbol, naming, mass number, atomic

number locations etc.)

Review• Take out some notebook paper and a pencil• If you are an expert on a topic, you will be

seeking out someone who is not and help them review for 5 minutes

• There are 4 topics total for the quiz today

Announcements

• Tutoring – Fridays• Quizzes – Wednesdays

Homework Collection

1. Bellwork/exit slip2. Density homework (from half sheet)3. Atomic numbers practice4. Bohr model iPad practice5. Bohr model drawings6. Isotope worksheet

Homework Collection – Honors

1. Bellwork/exit slip2. Density homework (from half sheet)3. Atomic numbers practice4. Bohr model iPad practice5. Isotope worksheet6. Isotope practice (half sheet)7. Average atomic mass practice sheet8. Average atomic mass homework

Quiz

Honors: Average Atomic Mass

• Continue working on average atomic mass practice

• You will have 30 minutes to complete the worksheet from Wednesday

Notes: The Periodic Table

Organizing the ElementsChemists used the properties of

elements to sort them into groups.

In 1829 J. W. Dobereiner arranged elements into triads – groups of three elements with similar properties– One element in each triad had

properties intermediate of the other two elements

Mendeleev’s Periodic Table

By the mid-1800s, about 70 elements were known to exist

Dmitri Mendeleev – a Russian chemist and teacher arranged elements in order of increasing atomic mass

Thus, the first “Periodic Table”

MendeleevHe left blanks for yet

undiscovered elementsWhen they were discovered, he had

made good predictions

But, there were problems :Such as Co and Ni; Ar and K; Te

and I

A better arrangement

In 1913, Henry Moseley – British physicist, arranged elements according to increasing atomic number

The arrangement used today

Thinking…

What is one similarity and one difference between Mendeleev’s periodic table and the modern one created by Moseley?

Arrangement

• The periodic is arranged by groups and periods

• Groups run UP and DOWN• Periods run LEFT and RIGHTNote this on your periodic table that I handed out

Groups are special

Groups are special because all elements in one group share similar properties or characteristics such as bonding, reactivity etc.

Halogens – salt formers

Exit Slip 8-28-2014

• What is the difference between groups and periods on the periodic table?

• Why are groups special?

Bellwork 9-2-2014

1. Get out your own sheet of paper2. Which scientist created the periodic table we

use today? 3. How did he order it (ex. by increasing…)?

**Pass back quizzes **Student data wall

Objective

• You will be able to describe in words, the general properties associated with specific groups and specific elements within each group.

Example• Given a Bohr model of Sodium, describe its

reactivity based on the number of valence electrons and its group on the periodic table.

Periodic Table Song

• https://www.youtube.com/watch?v=zUDDiWtFtEM

Periodic Table Groups

Alkali Metal Video• http

://www.youtube.com/watch?v=cqeVEFFzz7E • Compound Chem– http://www.compoundchem.com/infographics/

• Fill out the note taker on each group using information from the website

• Color in periodic table as instructed ON THE NOTETAKER

When Finished…

• You will be creating a poster on one of the periodic table groups as a group

• You must include all of the information from your note taker on your periodic table group poster – Be sure to make the elements and the valence

electrons MOST visible on your poster

Honors – When Finished…

• You will be creating a video with your group on one of the periodic table groups

• This video will be shared with the rest of the class and with the regular sections to help them better understand each group

Video• Video must be no longer than 3 minutes • Ideas:– Put on a play or skit about the group of elements you are

representing – Create a commercial to sell the group of elements you are

presenting • Must include:– All info from your note taker + any additional information

you research– Research – one piece that you did not understand and

explain it (i.e. alkali metals react with water, how?)– Most important: valence electrons, elements within the

group

Exit Slip 9-2-2014

HomeworkPart 1Using Bohr model rules, how many valence (outer shell) electrons are in the elements 1-10 on the periodic table? Ex. Valence electrons:

1 H = 2 He =3 Li =

Part 2Question: what patterns do you notice while figuring these out (give at least 2)?