Question
Write the electronic configuration of first four elements in this group.
| Elements | Electronic configuration |
| Hydrogen | 1 |
| Lithium | 2, 1 |
| Sodium | 2, 8, 1 |
| Potassium | 2, 8, 8, 1 |
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| Column I | Column II |
| (1) Polluting energy | (a) Soot particles |
| (2) Eco-friendly energy | (b) Thermal energy |
| (c) Nuclear energy | |
| (d) Wind energy |
| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of $-CH_2-$ units | Boiling point $^\circ C$ |
| Ethene | $C_2H_4$ | $CH_2= CH_2$ | $2$ | $0$ | $-102$ |
| Propene | $C_3H_6$ | $CH_3–CH = CH_2$ | $3$ | $1$ | $-48$ |
| $1-$Butene | $C_4H_8$ | $CH_3–CH_2–CH = CH_2$ | ______ | ______ | $-6.5$ |
| $1-$Pentene | $C_5H_{10}$ | $CH_3–CH_2–CH_2–CH = CH_2$ | ______ | ______ | $30$ |