题目

It’s not easy being a teenager—nor is it easy being the parent of a teenager．You can make your child feel angry, hurt or misunderstood by what you say without realizing it yourself．It is important to give your child the space he needs to grow while gently letting him know that you’ll still be there for him when he needs you． Expect a lot from your child，just not everything．Except for health and safety problems， such as drug use or careless driving，consider everything else open to discussion．If your child is unwilling to discuss something，don’t insist he should tel X元素原子的核内质子数为a，其阴离子Xm－与Y元素的阳离子Yn+的核外电子排布相同，那么Y元素原子的质子数是(用a、m、n表示)________．