Clil Module Periodic Table Of The Elements Worksheet - Prof.ssa Elena Tibaldi - Istituto Sant''Anna - 2012-2013 Page 24
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48GROUP 1 ELEMENTS: ALKALI METALS
Group 1 elements are called alkali metals. The most common alkali metals are: lithium,
sodium and potassium.
All of the alkali metals have similar physical properties:
• are soft metals
• are shiny and silvery when cut
• are good conductors of electricity and heat
• have low melting points and boiling points; melting points and boiling points decrease
down the group
• have low densities and the density generally increases down the group
All of the alkali metals have similar chemical properties:
• are very reactive with water and oxygen, therefore they must be stored in oil
• they tend to lose one electron from the outer shell and become positive ions (ex. Na
)
+
• reactivity increases down the group (Ex. K>Li) as the outer shell electron is further
away from the nucleus.
• they react with oxygen forming oxides (ex. K
O potassium oxide)
2
• they react with water to produce an acqueous solution of hydroxide and hydrogen (ex.
2Na + 2H
O
2NaOH + H
)
2
2
Alkali metals compounds:
• are very stable and difficult to separate by chemical means
• do not decompose on heating and are soluble in water
24
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education