;
子;So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!
它所知甚少,因为在1立方英尺的铀矿石中,仅有1个钫原子!
钫So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!
它所知甚少,因为在1立方英尺的铀矿石中,仅有1个钫原子!
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