Question

Which of the following have f7 configuration?
(1) Eu
(2) Gd
(3) Am
(4) All of these​

Answer 1

Answer:

all of these

Explanation:

I'm not sure

Answer 2

Answer:

All three elements, Eu, Gd and Am has f7 configuration.

Explanation:

• Elements of f block has electronic configuration in the form of (n-2)f (n-1)d¹ ns².
• Eu has atomic number 63. Its configuration is [Xe]₅₄ 4f⁷6s². That one d electron transitioned to f orbital to help it attaining half-filled stability.
• Gd has atomic number 64. Its configuration is [Xe]₅₄ 4f⁷ 5d¹ 6s². It also has half-filled stability.
• Am has atomic number 95. its configuration is [Rn]₈₆ 5f⁷ 7s². It is a part of actinoids and attain half-filled stability.
• Thus all three has f⁷ configuration.

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