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Transcript of Science
Group VII: Halogens
Group 0: Nobel Gases
It is a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.
You will be learning about...
The Periodic Table:
By: Ain, Jeslyn, Manting, Tania, syazana
What is the periodic table?
The change of a metallic to non-metallic element
Elements in Group I, VII, 0
Alkali metals react with water to produce Akaline solution
These metals all have 1 electron in their valence shell
Thus they can lose this electron to form an ion with a + charge
Why is that so?
As the atom gets bigger, they find it increasingly easy to lose the electron as it is along while away from the nucleus
The electron on the other shell interfere and stop the nucleus holding on to the electron
(this process is known as Shielding)
The no. of shells that these metals have are all related to the row they are on the periodic table
The number of the shells of each metal = to their no. of their period
Softness,Reactivity & Density Increases
MElting point + Boiling point decreases
the physical and chemical properties of group 1
1. -They have low melting and boiling points
compared to other metals.
- the melting point decreases as it goes down the group, same goes for the
2. - These alkali metals have low densities
compared to other metals
- they tend to feel lighter
- the densities will increase when you
go down the group.
3. -They are soft.
- Lithium is the hardest alkali metal .
- As you go down the group, the metals
will get softer
4. they react quickly with water, producing hydroxides and hydrogen gas.
5. their hydroxides and oxides dissolve in water to form alkaline solutions
chemical properties of GROUP 7
- halogens also have low melting
and boiling points
- but both melting and boiling point increase as you go down the group
-they tend to change in state
from gas to liquid to solid down the
group. for example, fluorine and chlorine
are gases while bromine is a liquid at room
-the colour will also be darker as you go
down the group
- poor conductors of heat and electricity
- the melting and boiling points
increases as you go down the group
- they are unreactive
- they are colorless
- low densities. the density increase
as you go down the group
The explanation of non- reactivity of NOBLE GASES.
All noble gases have complete valence shell.
THIS GIVES THE ELEMENTS THE MOST STABLE CONFIGURATION THEY CAN ACHIEVE.
NOBLE GASES CAN BE FOUND IN THEIR FREE FORMS IN NATURE.
helium in balloons
liquid neon in lights.
GROUP 7 (halogens)
WHAt are HAlogens?
They are toxic non-metals that all have 7 electrons in their valence shell
thus they gain 1 electron to have a stable configration
Halogens can react to some metals to form
(e.g. sodium chloride)
Halogens also can react with Hydrogen to form
(e.g. Hydrogen chloride)
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