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Activity 1.6
1
Classify elements from atomic number 11 to 18 as metals and non-metals depending on the electrons present in the outermost shell.
Ans:
Element
Atomic Number
Number of electrons
in the outermost shell
Metal/Non-metal
Sodium
11
1
Metal
Magnesium
12
2
Metal
Aluminium
13
3
Metal
Silicon
14
4
(Metalloid)
Phosphorus
15
5
Non-metal
Sulphur
16
6
Non-metal
Chlorine
17
7
Non-metal
Argon
18
8
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2
Write the electronic configuration of Mg, K, Ar and F.
Ans:
Element
Electronic Configuration
Magnesium (Mg)
2, 8, 2
Potassium (K)
2, 8, 8, 1
Argon (Ar)
2, 8, 8
Fluorine (F)
2, 7
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