Recap Subatomic particles Mendeleev v. Mosely. Recap Subatomic particles Mendeleev v. Mosely.

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Presentation transcript:

Recap Subatomic particles Mendeleev v. Mosely

How small is an atom? https://www.ted.com/talks/just_how_small_is_an_atom?language=e n

#36 Groups and Periods: Periodic Table Properties

Important Features of the Periodic Table: Periods (Row) Periods are the horizontal rows of elements on the periodic table How many periods (rows) are on the Periodic Table Of Elements? FROM LEFT TO RIGHT OR RIGHT TO LEFT

Period A horizontal row in the Periodic Table.

*Period (Row) Properties There are seven horizontal periods on a periodic table (numbered from the top down) Atomic numbers and atomic masses increase as you move from the left to the right in a period All atoms of the elements in the same period have the same number of shells Example Period 1 = 1 shell Period 2 = 2 shells Period 3 = 3 shells Etc…

How many groups (families) Important Features of the Periodic Table: Group (Family) These are the columns of elements on the periodic table How many groups (families) are on the Periodic Table Of Elements? FROM TOP TO BOTTOM OR BOTTOM TO THE TOP

Group A vertical column in the Periodic Table.

*Group (Family) Properties There are eighteen vertical groups on the periodic table (numbered from left to right) Atomic numbers and atomic masses increase as you move from the top down in a group (family) Atoms of elements in the same group have the same number of valence electrons Exceptions: Transition elements (3-12) Hydrogen (could be similar to groups 1 or 17) Helium (actually has 2 valence electrons)

*How can I remember this… Periods Pull Groups Grow

Group properties textbook notes Turn to page D26-32 in textbook and read about the different groups on the periodic table Color your small periodic table based off the colors mentioned and take notes on the groups mentioned on the next slide.

#37 – Group properties notes D26-32 Color hydrogen –red Group 1 –yellow Group 2 - orange Groups 3-12 – light brown Group 17 – green Group 18 – blue Bottom two rows - purple

#37 – Group properties notes D26-32 Color hydrogen –red Group 1 –yellow Group 2 - orange Groups 3-12 – light brown Group 17 – green Group 18 – blue Bottom two rows - purple Notes need to be organized like so: Carbon family (Group 14) Information about this group written here. Nitrogen family (Group 15)