Verified Answer :

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The most brittle one is selenium!

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Answer:

a. Selenium

Explanation:

Hello,

Selenium is a crystalline non-metallic element that has variable properties depending on how it is prepared, but they are all hard solids. Zinc is less brittle than selenium since it has stronger metallic properties. On the other hand, cobalt and platinum are strong metals that are far away to be brittle.

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