HELLO MINIONS!!!We have work to do.

WHAT ARE WE UP TO TODAY?

• Go over History of the PToE.

• PToE basics.

PERIODIC TABLE OF ELEMENTS

• Why is organization important?• As students why must you be organized?

• What is a pattern?• Where do you see patterns?

PTOE HISTORY

• 1869 • 63 elements were discovered• Few gasses, few liquids, most solids

• Dmitri Mendeleev (men duh LAY ef)• There are patterns here!• Some had similar physical and chemical properties• Wrote down some info on individual cards

• Melting Point• Density• Color• Atomic mass & number of chemical bonds it can form

PTOE HISTORY

• AHA!!!• He noticed a pattern of properties appeared when he

placed them in order of increasing atomic mass!• He also found that the properties repeated!

• After Fluorine was Sodium (neon wasn’t discovered yet)• Sodium reacted with water like Lithium (Li) and

Potassium (K).

HERE WAS HIS PTOE!!!

MODERN PTOE

A LOT OF STUFF!!!

• Solid, liquid, gas, not found in nature!

• Metal, metalloid, nonmetal

• Stable, kinda stable, unstable

• Listed in Periods and Groups

• A LOT TO TAKE IN!!!• “Don’t Panic”

HERE IS HOW IT IS ORGANIZED!

• Period: Horizontal Row ↔• Contains a series of different elements, just like a days

of the week on a calendar!• Left side: HIGHLY REACTIVE!!!• Middle: Less reactive metals• Right Side: Metalloids then nonmetals.

HERE IS HOW IT IS ORGANIZED!

• Group: Vertical Row. ↕• Also known as “families”• These elements are similar to each other, like on a

monthly calendar all the days that are “Monday” or “Saturday”.

• Group 1 reacts violently with water• Group 17 reacts violently with group 1• Group 18 tend to be stable

MODERN PTOE

LOOK A LITTLE CLOSER…

SOME STUFF TO GET STRAIGHT…

• Elements all have multiple isotopes with individual atomic weights so the mass is determined by the weighted mean of all of the isotopes.

HOW ELEMENTS FORM…

NUCLEAR FUSION!!!

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NEXT UP…

Questions & Homework