The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday –...

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The Periodic Table Mr. Fox Science Class

Transcript of The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday –...

Page 1: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

The Periodic Table

Mr. Fox Science Class

Page 2: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Looking for the Pattern

• Remember back to Friday– Valence Electrons– Dot Models of Elements– What do you see when you set up the elements

like they are on the table?

Page 3: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Dmitri Mendeleev

• Russian Scientist in 1869 found a pattern in the elements himself.

• Evidence of the Patterns– Similar chemical and physical properties– Atomic mass – Bonding power (dot models)

Atomic mass – average mass of one atom of an element.

Page 4: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

He noticed that patterns appear when the elements were arranged in order of increasing atomic mass.

Page 5: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.
Page 6: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Periodic Table Today

Page 7: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

How to read the table

Page 8: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

The stuff

• Chemical Symbol – the one or two letters that stand for an element. Ex: Fe = iron K = potassium

• Atomic Number – number of protons in a nucleus of an atom

• Atomic Mass • Element’s Name

Page 9: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Other things you might see.

• Ion charges • Bonding power• Chemical activity• Size of atom

Page 10: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Organization of Table

• Group – (AKA families)• They are shown in columns on the periodic

table• Each of the elements have similar chemical

properties• Ex: group 18 elements do not react with other

chemicals normally.

Page 11: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Organization of Table

• Period• Horizontal rows across the table• Properties change as you move along a period.• They are predictable• Ex: as you move from the left to the right, the

elements get less reactive. The atoms get larger.

Page 12: The Periodic Table Mr. Fox Science Class. Looking for the Pattern Remember back to Friday – Valence Electrons – Dot Models of Elements – What do you see.

Valence Electrons

• Each group of the periodic has the same number of valence.

• Dot Models showed this to scientists• The real pattern that comes out