Do Now: Do Now:

What are the three sub-atomic particles of an atom and their charges?

Which sub-atomic particles make up the nucleus of the atom?

Take five minutes: Take five minutes:

Group the following list of songs/artist in the way that makes the most sense to you: Today was a fairy tale by Taylor Swift Tik Tok by Kesha Imma Be by Black Eyed Peas Carry Out by Timbaland ft. Justin Timberlake BedRock by Young Money and Lloyd Bad Romance by Lady Gaga Baby by Justin Bieber ft. Ludacris Replay by Iyaz How low by Ludacris

Think Pair Share: Think Pair Share:

Pair with someone next to you, and quietly (really) compare how you guys grouped those songs.

What characteristics did you use to organize the songs?

What other ways could you have organized those songs?

How is the Periodic Table How is the Periodic Table organized? organized?

An Element is a substance made of one type of atom. There are 117 different types of elements. Examples are hydrogen, copper, helium, oxygen, etc.

In the 1800’s, scientists decided to organize the elements according to their properties

However, none of the suggested methods worked very well…until….

And the Periodic Table was And the Periodic Table was born…born…

In 1860, a Russian chemist Dmitri Mendeleev began writing all the elements on notecards with their atomic mass, and any properties.

He began listing them, organizing them so that going down a column the elements had similar properties

In 1869, he produced the first periodic table.

It is called the periodic table because it shows a periodic, or repeating pattern, of properties

The modern Periodic The modern Periodic Table Table

The periodic table organizes the atoms of elements by similar properties and atomic number

***The difference between one element and another element is the # of protons (atomic number) in that element

How to read the periodic How to read the periodic table: table:

Element name

Atomic number

Element symbol

Atomic mass

Element name: the scientific name of the element

Atomic number: number at the top of the box, represents the # of protons in the nucleus

Element Symbol: abbreviation of the element’s name

Atomic Mass: average mass of all the isotopes of that element (protons+neutrons)

Trends and Patterns in Trends and Patterns in the tablethe table

In the vertical columns are known as groups (and they are numbered) They show similarities in their chemical and

physical properties Famous Group 17 – halogens. Halogens tend to

combine easily with other elements or compounds

Famous Group 18 – Nobel gases.

Trends and Patterns in Trends and Patterns in the tablethe table

Each horizontal row is called a period Properties of elements change in a predictable

way from one end of a period to another

Atomic Size Decreases

Now let’s practiceNow let’s practice

See Atomic Calculations Worksheet