Question

has noble gas core plus 14f-electrons and 10 d-electrons.
(A) Gallium
(B) Indium
(C) Thallium (D) Boron
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Answer 1

Answer:

(D) Boron

Boron and Aluminium have noble gas core, gallium and indium have noble gas +10 d-electrons and thallium has noble gas +14 f + 10d electrons core.

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Answer 2

thallium is the answer......

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