However , such an " anti - periodic table of elements " is thought to be , at best , highly unlikely , as the quantities of antimatter required would be , quite literally , astronomical 然而，如此的一个被想象的“元素反周期表” ，充其量,可能性不大,照字面上理解如同必需的反物质的量会是大得无法估计那样。
2.
This is an interesting periodic table of elements with pictures provided at the matching position of every element . it introduces to visitors various elements and relevant basic knowledge through the performance of a multi - media cartoon 这是一张趣味元素周期表，表中在每个元素相应位置上都配有图片，通过多媒体动画演示向观众介绍各个元素及与其相关的基本知识。
