Periodic Table
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Transcript Periodic Table
Unit : Periodic Table
Elements and their
Properties
Periodic- regular repeating pattern
I. Metals
Found on left side of table
Majority of elements on table
Properties of Metals
solid at room temp
– (except Hg)
Properties of Metals:
Conduct heat and electricity
Luster reflect light well (shiny)
Properties of Metals:
Malleable – can be hammered or rolled into
sheets; Capable of being shaped or formed
Properties of Metals:
Ductile – can be
drawn into wires
Tend to lose or
give up outer
electrons
form positive ions
Alkali Metals - Group #1
1 valence electron
softer and more reactive
than other metals
especially with oxygen
and water
Alkali Metals:
Don’t occur naturally in elemental
form
– usually in compound form
Flame test:
Li crimson
Na Yellow Orange
K Violet
Alkaline Earth Metals Group 2
Moderately
reactive
not found
naturally in
elemental
form
Alkaline Earth Metals
Form bases when react with water
2 valence electrons
Flame test:
–
–
–
Calcium dull red
Mg Bright white flash
Strontium –-> bright red
Barium –-> dull yellowish green
Transition Metals Groups 3-12
Often occur in nature as uncombined elements
Transition Metals:
Typically form colored
compounds – Cr found
in rubies and emeralds
Transition Metals
Iron
triad
iron, cobalt, nickel
– Only elements
known to create
magnetic field
–
Iron
most widely
used of all
metals
– main
ingredient in
steel
– found in
hemoglobin
–
Coinage metals
Cu, Ag and Au –
Coinage metals since
once were commonly
used in coins
Cu – electrical wiring
Transition Metals
Nobel
Metals –
– Highly
– Ag,
Os
resistant to corrosion
Au, Hg, Pt, Pd, Ir, Rh, Ru,
Inner Transition Metals
located at bottom of table
** Called “Rare Earth Elements”
Rare Earth Elements
Lanthanide Series –
includes Lanthanum
(La)
Actinide Series –
includes Actinum (Ac)
–
–
All are radioactive, and
unstable
Uranium and Plutonium
are best known Nuclear
power
Transuranic Chemical
Elements
# 93 until the
end
all synthetic
(manmade)
usually disintegrate
quickly
Other Metals
Includes Al, Ga, In, Sn, Tl, Pb, Bi
Lead – toxic, no longer in paint and fuel
II.
Nonmetals
Right upper hand corner of table
Properties of nonmetals
Usually gases or brittle solids at RT
Usually Dull Appearance
Properties of Nonmetals
Not Malleable or ductile
Usually Poor Conductors
Tend to gain or share
electrons when forming
bonds form negative
ions
Hydrogen
Hindenburg
Most abundant element in universe
Diatomic molecule – two atoms of the same
element bonded together
Highly reactive element found mostly on Earth
as part of water compound
Halogens
Group 17 (have 7
valence electrons)
A salt forms when a
halogen forms bond
with a metal
Fluorine – in toothpaste
Chlorine
Cl – disinfectant and
bleach
–
(most abundant Halogen)
Noble Gases (or Inert gases )
Group 18
exist as isolated, stable atoms, normally
unreactive - are found in Elemental form
Noble Gases
Helium – used in blimps and balloons
Neon, Argon and Krypton – used in lights
III.
Metalloids
On either side of zigzag line
Have some metallic
and nonmetallic
properties
Partial Conduction
gives them
semiconductor
characteristics
What is an Allotrope?
Carbon – found in coal, oil, natural gas and
foods
All organic compounds contain carbon, but not
all compounds are organic
Has 3 allotropes Same element with different
molecular structures:
1. Graphite
2. Diamond
3. Buckminsterfullerene (“Bucky Balls”)
1. Graphite
2. Diamond
3. Buckminsterfullerene
(“Bucky Balls”)
Carbon 60 molecule
IV. Periodic Properties of Elements
Electron Affinity –
–
elements ablilty to attract an
electron to it, increases left to
right on table
Ionization Energy (IE)
The amount of energy
required to remove an
electron from an atom
Easy to remove electron
from metals Low IE,
Very hard to remove
electron from nonmetal
High IE
IE increases as move left to
right on table
Atomic
Size- How
large
atom is
Atomic Size- How large atom is
“atomic radii”
Decrease left to right across a period
More electrons on energy level stronger
attraction between nucleus and the electrons
Smaller left to right on table
Increases down a family because add an
energy level as move down
Metallic Nature
elements less metallic as go left to right across
table
increases as go down a family