elements and the periodic table 1.1 metallic elements lo:i understand what holds the atoms together...
TRANSCRIPT
Elements and the Periodic
Table
1.1 Metallic Elements
LO: I understand what holds the atoms together in a metallic lattice.
The Metallic Lattice
A lattice is .
LO: I understand what holds the atoms together in a metallic lattice.
a regular repeating pattern
Each metal atom is made up of:
+
Negative outer
electron(s)A positive ion(nucleus and inner
electrons)
The outer electrons are to any one atom.
They are said to be and can move from atom to atom.
delocalised
not fixed
LO: I understand what holds the atoms together in a metallic lattice.
A metallic bond is the attraction between the negative delocalised electrons and the surrounding positive .
electrostatic
+ +
+This electron is attracted to all three nuclei
outer
The outer electrons of one metal atom are attracted to the nuclei of all the atoms.
surrounding
ions
Physical Properties of
MetalsLO: I understand how some properties of
metals relate to the metallic bonds.
Electrical Conductivity
(ability to be rolled into sheets)
(ability to be stretched out into wires)
Malleable
Ductile
LO: I understand how properties of metals relate to the metallic bonds.
Metals are able to conduct electricity as the outer electrons are and can move from one end of the metallic lattice to the other.
The forces holding the metallic lattice together act equally in directions.
This means that the metal atoms can move and slip past each other without the metallic bond.
delocalised
all
breaking
LO: I understand how properties of metals relate to the metallic bonds.
Boiling point
Period number
BoilingPoint(˚C)
Li
NaK Rb Cs
0200400600800
1000120014001600
1 2 3 4 5 6
Boiling point trend down group 1:
The boiling point down the group.
The outer electrons are from the nucleus and so are not held as tightly.
The strength of the metallic bond .
decreases
further away
decreases
LO: I understand how properties of metals relate to the metallic bonds.
Boiling point trend across a period 4:
The boiling point of the metals from left to right.
As the number of outer electrons , the strength of the metallic bond increases.
The number of outer electrons is .
Group Number
BoilingPoint(˚C) K
Ca
Ga
0
500
1000
1500
2000
2500
3000
1 2 3
increases
increasing
increases