1. Atomic Number ● Symbol ● Atomic Weight
Periodic Table
Atomic Number ● Symbol ● Atomic Weight

2. I made the PERIODIC TABLE !
I am Dmitri Mendeleev!
I made the PERIODIC TABLE !

3. Elements
Science has come along way since Aristotle’s theory of Air, Water, Fire, and Earth.
Scientists have identified 90 naturally occurring elements, and created about 28 others.

4. The most abundant element in the earth’s crust is oxygen.

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

6. Periodic Table
The periodic table organizes the elements in a particular way. A great deal of information about an element can be gathered from its position in the period table.
For example, you can predict with reasonably good accuracy the physical and chemical properties of the element. You can also predict what other elements a particular element will react with chemically.
Understanding the organization and plan of the periodic table will help you obtain basic information about each of the 118 known elements.

11. Families

23. How do you read the PERIODIC TABLE?

24. What is the ATOMIC NUMBER?
The number of protons found in the nucleus of an atom Or
The number of electrons surrounding the nucleus of an atom.

25. What is the ATOMIC WEIGHT?
The number of protons and neutrons in the nucleus of an atom.

26. What is the SYMBOL?
An abbreviation of the element name.

27. Common Elements and Symbols

28. How do I find the number of protons, electrons, and neutrons in an element using the periodic table?
# of PROTONS = ATOMIC NUMBER
# of ELECTRONS = ATOMIC NUMBER
# of NEUTRONS = ATOMIC _ ATOMIC
WEIGHT NUMBER

29. (different version of an element)
ion- atom that has become electrically charged as a result of gaining or losing an electron  isotope- one of several forms of an element, each containing the same number of protons in their atoms but a different number of neutrons
(different version of an element)

30. Most atoms have the same number of protons and neutrons
Isotopes
atoms that have more or less neutrons than protons
(same element)
An atomic mass number with a decimal is the total of the number of protons plus the average number of neutrons.

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