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Question
Give the basic demarkation of the Modern Periodic Table into metals, metalloids and non-metals with special reference to halogens and noble gases.
Solution
Modern Periodic Table is the arrangement of elements in increasing order of atomic numbers.
There are total 118 elements, the first element i.e. the atomic number 1 is Hydrogen and the last element i.e. the atomic number 118 is Ununoctium.
The elements are categorized mainly into 4 types, and these are:
- Reactive Metals: They are placed in the extreme left of the periodic table.
- Weak Metals: They are placed in the middle of the periodic table.
- Non-metals: They are placed in the upper right corner of the periodic table, and maybe subset further as halogens and noble gases.
- Metalloids: They have the properties of both the metals and non-metals.
| Metals | Metalloids | Non-metals - 17 |
| 91 | 7 | General- 7 H, C, N, O, P, S, Se Halogens- 4 F, Cl, Br. I, [At] Nobel gases- 6 He, Ne, Ar, Kr,Xe, Rn |
The above demarkation may vary, since the nature of some elements is still under research.
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