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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.
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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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