Transcript Periodic Table

The Periodic Table
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 Horizontal
rows are called periods
 There are 7 periods
 Vertical
columns are called groups or
families.
 Elements are placed in columns by
similar properties.
The Different Groups of Elements
1
2
18
13 14 15 16 17
3
4
5
6
7
8
9 10 11 12
Metals
Metals
Luster – shiny.
 Ductile – drawn into wires.
 Malleable – hammered into sheets.
 Conductors of heat and electricity.

Transition metals
 These
are called the inner
transition elements and they
belong here
Dull
 Brittle
 Nonconductors
- insulators

Non-metals
Metalloids or Semimetals
Properties of both
 Semiconductors

B
Si
Ge As
Sb Te
Po At
 Group
1 are the alkali metals
 Group 2 are the alkaline earth metals
 Group
17 is called the halogens
 Group 18 are the noble gases
Why do we have a periodic table?
 Organizes
 Tells
the properties of atoms
us information about elements
that make up compounds
Answer the Following:

1.
2.
3.
4.
5.
Write down the element symbols on
the index card and indicate whether
they are metals (M), nonmetals (NM)
or metalloids (ME).
1. NM
H
2. NM
Se
Zn
3. M
Si
4. ME
Al
5. M
Numbers of electrons
Atoms of different elements have different
numbers of electrons but they may have
the same number of electrons in the outer
most energy level
 The outer most electrons help determine
the chemical properties of elements
 So how does the periodic table help us
figure out the number of outer electrons?

 We
use the group number to
determine the number of electrons in
the outermost energy level of an
atom.