Transcript Atomic Number and Mass

Periodic Table
How to use it…
ATOMIC NUMBER:
The number of protons in the nucleus.
 It is the number of protons that identifies
the element.
12.011 -4

+2
+4
AtomicAc
number
6
2-4
6
C
ATOMIC MASS:

The sum of the protons and neutrons in the
nucleus
AtomicAc
mass
12.011011
-4
+2
+4
6
2-4
6
C
NEUTRONS:

ROUNDED ATOMIC MASS – ATOMIC NUMBER
FOR EXAMPLE…CARBON
 ATOMIC MASS = 12.011…ROUNDED IS 12
 ATOMIC NUMBER = 6

12 – 6 = 6 NEUTRONS
ROUNDED
ATOMIC MASS
ATOMIC NUMBER
VALENCE ELECTRONS:
•
Electrons that are involved in transfer or
sharing
•
Located in the outer level of the atom
•
Not all electrons in an atom are involved in the
sharing or transferring
•
2 ways to represent the number of valence
electrons:
•
The Bohr Model
•
Lewis Structure
VALENCE ELECTRONS:
12.011
+2
+4
6
2-4
Electron
configuration
2 - 4
-4
C
PERIODIC TABLE OF ELEMENTS:
 Organization
Atomic
Mass
of the all known elements based
on their properties – such as atomic number.
12.011
C
Atomic
Number
6
2-4
-4
+2
+4
Selected
oxidation
state
Electron
Configuration