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সবথেকে কঠিনতম মৌলটি অধাতু। এর নাম হিরে, এটি কার্বনের রূপভেদ।
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সবথেকে কঠিনতম মৌলটি অধাতু। এর নাম হিরে, এটি কার্বনের রূপভেদ।