Periodic Table Notes

The Periodic Table of Elements  Periodic – Repeated in a pattern

The Periodic Table of Elements  Periodic – Repeated in a pattern The Periodic Table is an arrangement of the elements according to a repeating change in their properties

The Periodic Table of Elements  The Table was developed by Dimitri Mendeleev in the late 1800's.

The Periodic Table of Elements  The Table was developed by Dimitri Mendeleev in the late 1800's.  He arranged the elements in order of increasing atomic mass

The Periodic Table of Elements  The Table was developed by Dimitri Mendeleev in the late 1800's.  He arranged the elements in order of increasing atomic mass  He noticed a repeating pattern in the properties of these elements

The Periodic Table of Elements  The Table was developed by Dimitri Mendeleev in the late 1800's.  He arranged the elements in order of increasing atomic mass  He noticed a repeating pattern in the properties of these elements  Mendeleev's table had blank spaces, where elements with that particular mass had not been discovered.

The Periodic Table of Elements  He predicted the properties of these unknown elements  When the elements were discovered, he had been very accurate

Mendeleev

The Modern Periodic Table

 Henry Mosely reconfigured the Periodic Table to be arranged by atomic number instead of atomic mass-1913

The Modern Periodic Table  Henry Mosely reconfigured the Periodic Table to be arranged by atomic number instead of atomic mass-1913  The modern Periodic table has one box for every element in increasing order by Atomic Number

Modern Periodic Table

Groups  Vertical columns in the table are called groups or families

Groups  Vertical columns in the table are called groups or families  Atoms in the same group have the same number of outer electrons

Groups  Vertical columns in the table are called groups or families  Atoms in the same group have the same number of outer electrons  Since the properties of the atom is determined by the number of outer electrons, atoms in the same group have the same properties

What is a property?  GROUP #18 -Noble Gases- have a full outer shell….non-reactive  GROUP #17- Halogens- seven outer electrons- very reactive  How reactive atoms are!!!!  Properties- shiny, good conductors, solid at room temp, gases or brittle solids, do not conduct well

Periods  Periods- the horizontal rows are called periods

Metals vs Nonmetals  Stair-Step Line- starts between Boron and Aluminum

Metals vs Nonmetals  Stair-Step Line- starts between Boron and Aluminum  Metals- all elements to the left of the stair step line Hydrogen is the FREAK!!

Metals vs Nonmetals  Stair-Step Line- starts between Boron and Aluminum  Metals- all elements to the left of the stair step line Hydrogen is the FREAK!! Properties- shiny, good conductors, solid at room temp

Non-metals  Non-Metals- all elements to the right of the stair step line and Hydrogen

Non-metals  Non-Metals- all elements to the right of the stair step line and Hydrogen  Properties- gases or brittle solids, do not conduct well

Metalloids  Metalloids- any element that is touching the stair step line.  Properties of both metals and non- metals

Metals vs. Non-metals

What is the ultimate goal in life for an atom?

 Bond with other atoms!!!!!