QQuestion
Explain the position of hydrogen in the modern periodic table. Which group of the periodic table contains solid, liquid and gaseous elements? [2+1]
✓Answer
Position of Hydrogen
Hydrogen has the electronic configuration 1s¹.
- Like Group 1 (Alkali metals), it has one valence electron and can lose one electron to form H⁺.
- Like Group 17 (Halogens), it requires one electron to become stable and can gain one electron to form H⁻.
Therefore, hydrogen shows properties of both Group 1 and Group 17, and hence occupies a unique position in the modern periodic table.
Group 17 (Halogens) contains solid, liquid and gaseous elements:
- Fluorine (F₂) and Chlorine (Cl₂) – Gases
- Bromine (Br₂) – Liquid
- Iodine (I₂) and Astatine (At) – Solids
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