Lec: Periodic Table of Elements
1
1.00794
H
Hydrogen
Element: Is the
simplest form of
matter. An atom is
the smallest piece
of matter that can
be identified as an
element.
1
1.00794
H
Hydrogen
Atomic Name:
1
1.00794
H
Hydrogen
Atomic Number:
Indicates the
number of protons
and electrons in a
neutral atom.
1
1.00794
H
Hydrogen
Atomic Mass:
Measured in
Atomic Mass
Units or
AMU’s. 1
AMU is equal
to the mass of a
proton.
1
1.00794
H
Hydrogen
Atomic Symbol
1 or 2 letters. If
the Atomic
symbol has a
second letter it
must be lower
cased.
Calculating the number of Neutrons
Atomic Mass - Atomic # = # Neutrons
(rounded)
Ex: Hydrogen
1 - 1 = 0 Hydrogen has no neutrons.
Calculate the number of neutrons
for O which is oxygen.
Oxygen
Mass = 15.9994 or 16
Atomic Number = 8
16 - 8 = 8
Oxygen has 8 neutrons.
Types of Elements
Metals:
1. Good conductors of heat and
electricity.
2. Low melting points.
3. Malleable (Easily bent).
4. Shiny or lustrous.
Non-Metals:
1. Poor conductors of heat and
electricity.
2. Very high melting points.
3. Brittle.
4. Dull.
Metalloids: Have
characteristics from both metals
and non-metals.
The following elements are found
in the liquid state of matter at
room temperature: 35 and 80.
These are either a metal or nonmetal.
Periods and Groups
• Periods are horizontal rows on the Periodic
Table of Elements increasing by Atomic
Number.
• Groups are vertical columns on the Periodic
Table of Elements where elements have
similar chemical properties. Groups are
also called families.
On your worksheet complete
the table for the element: V
Atomic Name: Vanadium
Atomic #, # of Protons, and Electrons: 23
# of neutrons: 28
Atomic Mass: 50.9415 amu’s
Type of Element: Metal
Period 4
Group 5
Atomic Name Origin: English