题目

Being Left-handed in a Right-handed World        The world is designed for right-handed people, but why does a tenth of the population prefer the left?  36  The answer to it remains a bit of a mystery. Since scientists have noticed that left-handedness tends to run in families, it’s assumed that left-handedness has a genetic(基因的) component to it.   37   In fact, identical twins, who share the same genes, can sometimes prefer to use different hands. There are also plenty of theories on what else might determine which hand you write with, but many experts believe tha如图是元素周期表的一格，根据反映的信息回答（1）该元素的原子核外电子数    ．（2）该元素属于    ．（填“金属元素”或“非金属元素”）（3）除此之外，你还得到信息有    ．（一条即可）