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प्रश्न
Which atom is indicated by the following configuration?
[He] 2s1
उत्तर
[He] 2s1
The electronic configuration of the element is [He] 2s1 = 1s2 2s1.
∴ Atomic number of the element = 3
Hence, the element with the electronic configuration [He] 2s1 is lithium (Li).
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