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331.

Which of the following elements never show positive oxidation number?

Boron (B), Si, Ge, As, Sb, Te and At are the metalloid elements. Bismuth (Bi) and tin (Sn) are metals while carbon (C) is non-metal.

333.

What is the name of element with atomic number 105?

334.

Which among the following elements have lowest value of IE₁?

335.

KI and CusO₄ solution when mixed, give :