Alkali Metals: Group 1 Elements
Groups 1 - the Alkali Metals
starter
•
What is the name of the group 1 elements?
•
Name 3 of these elements.
•
If one of these elements has the symbol and
atomic number and mass
•
Na
•
What are the number of protons, neutrons and
electrons in this atom?
•
What is the electron arrangement in this atom
and how do we know what group we should
place it in?
2
3
1
1
answers
•
What is the name of the group
1 elements?
•
Name 3 of these elements.
•
If one of these elements has
the symbol and atomic number
and mass
•
Na
•
What are the number of
protons, neutrons and
electrons in this atom?
•
What is the electron
arrangement in this atom and
how do we know what group
we should place it in?
•
Alkali metals
•
Lithium, sodium, potassium,
rubidium, caesium, francium
•
Protons = 11
•
Neutrons = 12
•
Electrons = 11
•
2,8,1
•
Placed in group 1 as the atom
has one electron in its outer
shell
2
3
1
1
Walt and WILF
•
WALT
•
Different elements have different properties related to
their position in the Periodic Table
•
WILF
•
Locate the position in the Periodic Table of the alkali
metals.
•
Recall how the alkali metals react with water and how
this reaction changes as we travel down the group.
•
Recall whether these reactions are endothermic or
exothermic.
Group 1 – The alkali metals
Groups 1 and 2
•
Groups 1 and 2 are always found in nature
combined with other elements.
•
They’re called active metals because of their
readiness to form new substances with other
elements.
•
They are all metals except hydrogen, the first
element in Group 1.
•
Although hydrogen is placed in Group 1, it
shares properties with the elements in Group
1 and Group 17.
Alkali Metals
•
The Group 1 elements have a specific family
name—alkali
metals.
•
These elements increase in
their reactivity, or tendency
to combine with other
substances, as you move
from top to bottom.
Walt and WILF
•
WALT
•
Different elements have different properties related to
their position in the Periodic Table
•
WILF
•
Locate the position in the Periodic Table of the alkali
metals.
•
Recall how the alkali metals react with water and how
this reaction changes as we travel down the group.
•
Recall whether these reactions are endothermic or
exothermic.
Group 1 – The alkali metals
1) These metals all have ___
electron in their outer shell
Some facts…
2) Reactivity increases as you go _______ the group. This is
because the electrons are further away from the _______
every time a _____ is added, so they are given up more easily.
3) They all react with water to form an alkali (hence their
name) and __________, e.g:
Words
– down, one, shell, hydrogen, nucleus
Plenary 1.
•
Predict
•
What would happen if rubidium was added
to water.
•
1. how fast will it react?
•
2. Will it be endothermic or exothermic?
•
3. What gas will be formed?
•
4. What would be the word equation
Plenary 2.
•
Predict
•
What would happen if caesium was added
to water.
•
1. how fast will it react?
•
2. Will it be endothermic or exothermic?
•
3. What gas will be formed?
•
4. What would be the word equation?
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Alkali metals, found in Group 1 of the Periodic Table, include elements like lithium, sodium, and potassium. These metals are highly reactive, with properties that change as you move down the group. They have low densities and melting points, and their reactivity increases from top to bottom. Learn about their electron arrangements, properties, and reactions with water.
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Presentation Transcript
starter What is the name of the group 1 elements? Name 3 of these elements. If one of these elements has the symbol and atomic number and mass Na 11 23 What are the number of protons, neutrons and electrons in this atom? What is the electron arrangement in this atom and how do we know what group we should place it in?
answers What is the name of the group 1 elements? Name 3 of these elements. If one of these elements has the symbol and atomic number and mass Alkali metals Lithium, sodium, potassium, rubidium, caesium, francium 23 Na 11 Protons = 11 Neutrons = 12 Electrons = 11 2,8,1 Placed in group 1 as the atom has one electron in its outer shell What are the number of protons, neutrons and electrons in this atom? What is the electron arrangement in this atom and how do we know what group we should place it in?
Walt and WILF WALT Different elements have different properties related to their position in the Periodic Table WILF Locate the position in the Periodic Table of the alkali metals. Recall how the alkali metals react with water and how this reaction changes as we travel down the group. Recall whether these reactions are endothermic or exothermic.
Group 1 The alkali metals Li Na K Rb Cs Fr
Representative Elements Groups 1 and 2 Groups 1 and 2 are always found in nature combined with other elements. They re called active metals because of their readiness to form new substances with other elements. They are all metals except hydrogen, the first element in Group 1. Although hydrogen is placed in Group 1, it shares properties with the elements in Group 1 and Group 17.
Alkali Metals The Group 1 elements have a specific family name alkalimetals. All the alkali metals are silvery solids with low densities and low melting points. These elements increase in their reactivity, or tendency to combine with other substances, as you move from top to bottom.
Walt and WILF WALT Different elements have different properties related to their position in the Periodic Table WILF Locate the position in the Periodic Table of the alkali metals. Recall how the alkali metals react with water and how this reaction changes as we travel down the group. Recall whether these reactions are endothermic or exothermic.
Group 1 The alkali metals Some facts 1) These metals all have ___ electron in their outer shell 2) Reactivity increases as you go _______ the group. This is because the electrons are further away from the _______ every time a _____ is added, so they are given up more easily. 3) They all react with water to form an alkali (hence their name) and __________, e.g: Potassium + water potassium hydroxide + hydrogen 2K(s) + 2H2O(l) 2KOH(aq) + H2(g) Words down, one, shell, hydrogen, nucleus
Plenary 1. Predict What would happen if rubidium was added to water. 1. how fast will it react? 2. Will it be endothermic or exothermic? 3. What gas will be formed? 4. What would be the word equation
Plenary 2. Predict What would happen if caesium was added to water. 1. how fast will it react? 2. Will it be endothermic or exothermic? 3. What gas will be formed? 4. What would be the word equation?
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