Transcript Lec: Periodic Table of Elements

PERIODIC TABLE OF ELEMENTS
WebElements: A Periodic Table on the Web
Periodic Table of Elements: Videos
Interactive Periodic Table of Elements
1
H
1.00794
Hydrogen
Element:
The simplest
form of matter
Atom :
the smallest
piece of matter
that can be
identified as an
element.
1
H
1.00794
Hydrogen
Atomic Name:
Hydrogen
1
H
1.00794
Hydrogen
Atomic Number:
Indicates the
number of:
protons
electrons
in a neutral atom.
Atomic Mass:
1
H
1.00794
Hydrogen
Measured in
Atomic Mass Units
or (AMU).
1
AMU is equal to
the mass of a
proton.
DO NOT round
the mass to the
nearest whole
number
1
H
1.00794
Hydrogen
Atomic Symbol
1 or 2 letters.
The symbol
comes from its
English or Latin
name.
Calculating the number of Protons
Atomic # = # of Protons
Ex: Hydrogen
Atomic # = 1
# of Protons = 1
Calculating the number of Electrons
# of Protons = # of Electrons
Ex: Hydrogen
# of Protons = 1
# of Electrons = 1
Calculating the number of Neutrons
Atomic Mass (rounded to the nearest whole #) - Atomic # =
# of Neutrons
Ex: Hydrogen
Atomic Mass = 1
Atomic # = 1
1-1 = 0
Hydrogen has no neutrons.