Why does lanthanum form La3+ion, while cerium forms Ce4+ ion? (Atomic

1.	Why does lanthanum form La3+ion, while cerium forms Ce4+ ion? (Atomic number La = 57 and Ce = 58).
Answer» 1. Electronic configuration Lanthanum is La [Xe] 4f° 5d¹6s². By losing three electrons, La acquires stable electronic configuration of Xe and forms La³⁺. 2. Electronic configuration of Cerium is Ce [Xe] 4f¹ 5d¹6s². By losing four electrons, Ce acquires stable electronic configuration of Xe and forms Ce⁴⁺. Electronic configuration Lanthanum is La [Xe] 4f° 5d16s2. By losing three electrons, La acquires stable electronic configuration of Xe and forms La3+. 2. Electronic configuration of Cerium is Ce [Xe] 4f1 5d16s2. By losing four electrons, Ce acquires stable electronic configuration of Xe and forms Ce4.

Why does lanthanum form La3+ion, while cerium forms Ce4+ ion? (Atomic number La = 57 and Ce = 58).

Answer»

1. Electronic configuration Lanthanum is La [Xe] 4f° 5d¹6s². By losing three electrons, La acquires stable electronic configuration of Xe and forms La³⁺.

2. Electronic configuration of Cerium is Ce [Xe] 4f¹ 5d¹6s². By losing four electrons, Ce acquires stable electronic configuration of Xe and forms Ce⁴⁺.

Electronic configuration Lanthanum is La [Xe] 4f° 5d16s2. By losing three electrons, La acquires stable electronic configuration of Xe and forms La3+.

2. Electronic configuration of Cerium is Ce [Xe] 4f1 5d16s2. By losing four electrons, Ce acquires stable electronic configuration of Xe and forms Ce4.

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