Write about Atomicity of different elements.
Answers
Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen (O2) is composed of two oxygen atoms. So atomicity of oxygen is 2.[1]In older contexts, the term atomicity is sometimes used in the same sense as valency.
On the basis of atomicity, molecules can be classified as :
Monoatomic-composed of 1 atom e.g. He, Ne, Ar (all noble gases are monoatomic)
Diatomic-composed of 2 atoms e.g. H2 , N2 , O2
Triatomic-composed of 3 atoms e.g. O3
Polyatomic-composed of 3 or more atoms e.g. P4 , S8
All metals and some other elements, such as carbon, do not have a simple structure but consist of a very large and indefinite number of atoms bonded together. Their atomicity cannot be determined and is usually considered as 1.
Atomicity may vary in different allotropes of the same element.
The atomicity of the first 30 elements:
Atomic Number Element Atomicity
1 Hydrogen 2
2 Helium 1
3 Lithium 1
4 Beryllium 1
5 Boron 1*
6 Carbon 1
7 Nitrogen 2
8 Oxygen 2
9 Fluorine 2
10 Neon 1
11 Sodium 1
12 Magnesium 1
13 Aluminium 1
14 Silicon 1**
15 Phosphorus 4
16 Sulfur 8
17 Chlorine 2
18 Argon 1
19 Potassium 1
20 Calcium 1
21 Scandium 1
22 Titanium 1
23 Vanadium 1
24 Chromium 1
25 Manganese 1
26 Iron 1
27 Cobalt 1
28 Nickel 1
29 Copper 1
30 Zinc 1
* Boron has too many allotropes.
** Silicon forms network lattice
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Explanation:
Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen (O2) is composed of two oxygen atoms. So atomicity of oxygen is 2.In older contexts, the term atomicity is sometimes used in the same sense as valency. ... Diatomic-composed of 2 atoms e.g. H2 , N2 , O.