Question

the electronic configuration of gadolinium atomic number 64 is​

Answer 1

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The electronic configuration of gadolinium atomic number 64 is [Xe] 4f7 5dl 6s2.

EXPLAINATION :

The electronic configuration of La (Z = 57) is [Xe] 5dl 6s2. Therefore, further addition of electrons occurs in the lower energy 4f-orbital till it is exactly half-filled at Eu (Z = 63) Thus, the electronic configuration of Eu is [Xe] 4f7 6s2. Thereafter, addition of next electron does not occur in the more stable exactly half-filled 4f7 shell but occurs in the little higher energy 5d-orbital. Thus, the electronic configuration of Gd (Z = 64) is [Xe] 4f7 5dl 6s2.

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Answer 2

${\huge{\mathfrak{Answer}}}$

Xe 4f7 5d1 6s2

Atomic number: 64

Electrons per shell: 2,8,18,25,9,2

Atomic mass: 157.25 u