Elements and the Periodic Table

Presentation on theme: "Elements and the Periodic Table"— Presentation transcript:

Elements and the Periodic Table
Chapter 17

Organizing the Elements
MENDELEEV’S ORDER Dmitri Mendeleev Trying to organize the 63 known elements so they were easier to understand

Organizing the Elements
MENDELEEV’S ORDER: Didn’t yet know about protons, neutrons and electrons, ONLY MASS.. What could he do?

Organizing the Elements
MENDELEEV’S ORDER: Increasing Atomic Mass Elements with similar properties were put in the same column

Organizing the Elements
Named “Periodic Table” because properties repeated ‘periodically’ from row to row. Like keys on a keyboard (octaves)

The Modern Periodic Table
The Periodic Law Once protons were discovered, what were elements organized by?

The Modern Periodic Table
Increasing Atomic Number.

The Modern Periodic Table
Properties were STILL grouped by column.

The Modern Periodic Table
So, Properties STILL repeated periodically (within a row).

The Modern Periodic Table
Like Cards in a deck:

The Modern Periodic Table
In the Modern table a PERIOD = a ROW. How many PERIODS are there? 7

The Modern Periodic Table
PERIODS = ROWS How many ELEMENTS are in PERIODS 1, 2, & 3? What does this remind you of?

The Modern Periodic Table
Numbers of electrons in each ENERGY LEVEL

The Modern Periodic Table
In the Modern Periodic table a COLUMN = a GROUP ELEMENTS within a GROUP have similar PROPERTIES.

The Modern Periodic Table
COLUMNS = GROUPS Therefore, properties repeat PREDICTABLY and PERIODICALLY.

The Modern Periodic Table
THIS IS CALLED PERIODIC LAW.

The Modern Periodic Table
There are 4 important pieces of information for each element Atomic number Element symbol Element name Atomic mass

The Modern Periodic Table
CLASSES OF ELEMENTS: State: solid, liquid, gas Natural & manmade: (91 of the first 92 are natural) METALS, NONMETALS & METALLOIDS

The Modern Periodic Table
Properties???? What happens to properties when you move from left to right across the table?

Representative Groups
“A” GROUPS

GROUPS Elements in groups have SIMILAR (not identical) PROPERTIES because they have the SAME NUMBER OF VALENCE ELECTRONS

Be sure to use a different color for each of the items below.
Journal Color in the Blank Periodic Table according to the following KEY. Be sure to use a different color for each of the items below. METALS NONMETALS METALLOIDS