Atomicity of MgCl2 ,Al 2 O 3,H2O
Answers
MgCl2= 3
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Answer:
Atomicity is defined as the total number of atoms present in 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:
Monatomic – composed of 1 atom e.g. He, Ne, Ar (all noble gases are monatomic)
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.
There is a simple way to determine the atomicity of any element. It can be determined as a ratio of molecular mass and atomic mass. For example, using the case of oxygen molecule, the molecular mass is 32 (= 2x16), while the atomic mass is 16. If we divide the two, we get atomicity as 2 (=32/16).
Explanation:
The atomicity of the first 31 elements in the periodic table is as follows:
Atomic Number Element Atomicity
1 Hydrogen(H) 2
2 Helium(He) 1
3 Lithium(Li) 1
4 Beryllium(Be) 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 Sulphur 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
31 Gallium 1