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The s-Block Elements
Name the elements of group 2. Write down their electronic configurations ?
The metallic elements beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) constitute group 2 of the periodic table. Radium is a radioactive element. These are known as alkaline earth metals.
Electronic configuration. The atoms of alkaline earth metals have two electrons in s-orbital outside a noble gas core. Therefore, their general electronic configuration is [Noble gas] ns2 where n = 2 to 7.
The electronic configuration of alkaline earth metals are given below:
| Element | At. No. | Electronic configuration |
| Beryllium (Be) | 4 | [He] s2 |
| Magnesium (Mg) | 12 | [Ne] 3s2 |
| Calcium (Ca) | 20 | [Ar] 4s2 |
| Strontium (Sr) | 38 | [Kr] 5s2 |
| Barium (Ba) | 56 | [Xe] 6s2 |
| Radium(Ra) | 88 | [Rn] 7s2 |
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Which is the most reactive alkali metal and why?
Why alkali metals do not form M2+ ions?
Name the radio active element in group 1. How does it resemble with the remaining elements of the group?
Why alkali metals are normally kept in kerosene oil?
Why lithium cannot be stored in kerosene?
Why does lithium form complexes?
Why are alkali metal ions diamagnetic and colourless?
Why are alkali metals the most electropositive in nature?
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