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Write the name and symbols of two most reactive metals belonging to group I of the periodic table. Explain by drawing electronic structure how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.
Names and symbols of the two most reactive metals belonging to group I of the periodic table:
| No. | Name of Metals | Symbol of Metals |
| 1. | Sodium | Na |
| 2. | Potassium | K |
Formation of sodium chloride:
Na $\rightarrow$ Na++ e-
2,8,1 2,8
Cl + e-$\rightarrow$ Cl-
2,8, 7 2,8,8
The class of compounds formed by the transfer of electrons from a metal to a non-metal is known as ionic compounds or electrovalent compounds.
Physical properties of ionic or electrovalent compounds:
- Ionic compounds are solids and are somewhat hard.
- Ionic compounds have high melting and boiling points.
- Ionic compounds are generally soluble in water and insoluble in solvents such as kerosene, petrol, etc.
- Ionic compounds conduct electricity in an aqueous solution and in a molten state. They do not conduct electricity in a solid state.
Updated on: 10-Oct-2022
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