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प्रश्न
Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?
उत्तर
The group 1 elements are called alkali metals which possess outermost electronic configuration as ns1.All the elements that have same outermost electron configuration possess similar properties and are placed in the same group.
| Atomic Number | Symbol | Electronic Configuration |
| 3 | \[\ce{Li}\] | 1s22s1 (or) \[\ce{[He]}\] 2s1 |
| 11 | \[\ce{Na}\] | 1s22s22p63s2 (or) \[\ce{[Ne]}\] 3s1 |
| 19 | \[\ce{K}\] | 1s22s22p63s24s1 (or) \[\ce{[Ar]}\] 4s1 |
| 37 | \[\ce{Rb}\] | 1s22s22p63s23d104s2sp65s1 (or) \[\ce{[Kr]}\] 5s1 |
|
55 |
\[\ce{Cs}\] \[\ce{Fr}\] |
1s22s22p63s23p63d104s24p65d105s25p66s1 (or) \[\ce{[Xe]}\] 6s1 \[\ce{[Rn]}\] 7s1 |
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