Introduction to the Periodic Table Atomic Number ● Symbol ● Atomic Weight

I am Dmitri Mendeleev! I made the PERIODIC TABLE !

What is the PERIODIC TABLE? o Shows all known elements in the universe o Organizes the elements by chemical properties

How else is it organized??  Mendeleev first arranged the elements by atomic mass.  But he noticed there was something still not quite right about it.  Now, the periodic table is arranged by atomic numbers.

How do you read the PERIODIC TABLE?

What is the ATOMIC NUMBER? o The number of protons found in the nucleus of an atom

Also…  If it is a neutral atom (not an ION) the atomic number will also tell you the number of electrons!

What is the SYMBOL? o An abbreviation of the element name

What is the ATOMIC MASS? o The average mass of the atoms of a given element

How do I find the number of protons and electrons in an atom of an element using the periodic table? o # of PROTONS = ATOMIC NUMBER o # of ELECTRONS = # PROTONS (neutral atom)

Now you are almost as smart as I am! But not as handsome! Man, I look GOOD!

Periodic Table General Info

Parts of the Periodic Table  The periodic table is divided into groups and periods … –GROUPS:  VERTICAL COLUMNS  There are 18 groups –PERIODS:  HORIZONTAL ROWS  There are 7 periods

Special Group Names  Group 1 –Alkali Metals  Group 2 –Alkaline Earth Metals  Group 3-12 –Transition Metals  Group 17 –Halogens  Group 18 –Noble Gases Inner Transition Metals on Bottom (Lanthanides & Actinides)

How else is it organized?  Metals: –Found to the left of the staircase  Non-metals: –Found to the right of the staircase  On either side of the staircase are elements having both metallic and non- metallic properties –Called metalloids

See the staircase??

Colour Code Your “Blank Outline”

Make a Legend!!!  Group 1 - Alkali Metals  Group 2 – Alkaline Earth Metals  Group 3-12 – Transition Metals  Group 17 – Halogens  Group 18 - Noble Gases  Other metals – left of staircase  Other non-metals – right of staircase

Properties of…  METALS –Conduct electricity –Malleable:  Can be pounded into a thin sheet –Ductile  Can be drawn into wires –Solid at room temperature  Except Hg

Properties of…  NON-METALS –Do not conduct electricity –Brittle  If solid –Non-ductile –Solids, liquids or gases at room temperature

Properties of…  Metalloids –Have both metallic and non-metallic properties –Ex.  Silicon conducts electricity but is otherwise like non-metals –Include: B, Si, Ge, As, Sb, Te, At

Any Questions so far?

Textbook Task  Use notes and textbook (page 96)  Complete: –#12 to 21 on page 97