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प्रश्न
The electronic configuration of lanthanum (At. no. 57) is [Xe] ______.
रिकाम्या जागा भरा
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उत्तर
The electronic configuration of lanthanum (At. no. 57) is [Xe] 5d1 6s2.
Explanation:
Lanthanum has an atomic number of 57. After the xenon core [Xe], the next electrons enter the 6s and 5d orbitals. The 4f orbitals start filling only from cerium (Z = 58), not from lanthanum.
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