题干

现有四种元素的基态原子的电子排布式如下:

①1s22s22p63s23p4②1s22s22p63s23p3③1s22s22p3④1s22s22p5

则下列有关比较中正确的是(   )

A:第一电离能:④>③>②>①

B:原子半径:④>③>②>①

C:电负性:④>③>②>①

D:最高正化合价:④>③=②>①

上一题 下一题 0.0难度 选择题 更新时间:2020-01-18 05:40:52

答案(点此获取答案解析)

A

同类题1

阅读下列文章,完成下列小题。

苦瓜

肖复兴

       ①原来我家有个小院,院里可以种些花草和蔬菜。这些活儿,都是母亲特别喜欢做的。把那些花草蔬菜侍弄得姹紫嫣红,像是给自己的儿女收拾得眉清目秀、招人眼目,母亲的心里很舒坦。

       ②那时,母亲每年都特别喜欢种苦瓜。其实,这么说并不准确,是我特别喜欢苦瓜。刚开始,是我从别人家里要回苦瓜籽,给母亲种,并对她说:“这玩艺儿特别好玩,皮是绿的,里面的瓤和籽是红的!”我之所以喜欢苦瓜,最初的原因就是它里面的瓤和籽格外吸引我。苦瓜结在架上,母亲一直不摘,就让它们那么老着,一直挂到秋风起时。越老,它们里面的瓤和籽越红,红得像玛瑙、像热血、像燃烧了一天的落日。当我掰开苦瓜,兴奋地注视着这两片像船一样盛满了鲜红欲滴的瓤和籽瓜时,母亲总要眯缝起昏花的老眼看着,露出和我一样喜出望外的神情,仿佛那是她老人家的杰作,是她才能给予我的欧·亨利式的意外结尾,让我看到苦瓜最终这一落日般的血红和辉煌。

       ③以后,我发现苦瓜做菜其实很好吃。无论做汤,还是炒肉,都有一种清苦味。那苦味,格外别致,既不会传染上肉或别的菜,又有一种苦中蕴含的清香和苦味淡去的清新。

       ④像喜欢院里母亲种的苦瓜一样,我喜欢上了苦瓜这一道菜。每年夏天,母亲都会经常从小院里摘下沾着露水珠的鲜嫩的苦瓜,给我炒一盘苦瓜青椒肉丝。它成了我家夏日饭桌上一道经久不衰的家常菜。

       ⑤自从这之后,再见不到苦瓜瓤和籽鲜红欲滴的时候了,是因为再等不到那时候了。

       ⑥这样的菜,一直吃到我离开了小院,搬进了楼房。住进楼房,依然爱吃这样的菜,只是再吃不到母亲亲手种、亲手摘的苦瓜了,只能吃母亲亲手炒的苦瓜了。

       ⑦一直吃到母亲六年前去世。

       ⑧如今,依然爱吃这样的菜,只是母亲再也不能为我亲手到厨房去将青嫩的苦瓜切成丝,再掂起炒锅亲手将它炒熟,端上自家的餐桌了。

       ⑨因为常吃苦瓜,便常想起母亲。其实,母亲并不爱吃苦瓜。除了头几次,在我一再的怂恿下,勉强动了几筷子,皱起眉头,便不再问津。母亲实在忍受不了那股子异样的苦味。她说过,苦瓜还是留着看红瓤红籽好。可是,她依然每年夏天当苦瓜爬满架时,为我清炒一盘我特别喜欢吃的苦瓜肉丝。

       ⑩最近,看了一则介绍苦瓜的短文,上面有这样一段文字:“苦瓜味苦,但它从不把苦味传给其他食物。用苦瓜炒肉、焖肉、炖肉,其肉丝毫不沾苦味,故而人们美其名曰‘君子菜’。”不知怎么搞的,看完这段话,让我想起母亲。

同类题3

    One night, I was sitting in my kitchen half listening as my 15-year-old brother Tommy fought with my 12-year-old brother Kevin. I didn't pay attention when Kevin rushed up the stairs with the hurt on his face.
    About 20minutes later, as I was walking upstairs I heard Kevin crying inside the 1. I knocked on the door and asked, “Hey Kev, do you want to talk?” No answer. I tried again, “Hey, why don't you come out of there?” Again, no answer. So I took a stack of(一堆) cards and a pencil and wrote, “If you don't want to 2, we can write notes to each other.”
    An hour later I was 3 sitting on the floor outside the bathroom with two stacks of cards in front of me. One was blank(空白的) and the other was cards4Kevin on which he had translated all his unpleasant feelings into words for me.5 I read one of Kevin's notes, tears came to my eyes. It said, “6in this family cares about me, I’m not clever. Tommy thinks I’m a fool and Dad wishes he had the other Kevin as a kid because he’s better at basketball. And you’re never around to even 7me.”
    Tears came to my eyes as I wrote back to him. It was8what he had said about me. I wrote back, “You know Kev, I really do love you and I'm sorry I don't always show it to you. I am here for you and you are9 in this family.”
    There was no answer for a while, but then I heard a tearing sound coming from inside the bathroom. Kevin, who had 10 cards wrote on a torn-up(撕毁的) paper cup, “Thanks.”
    I wrote back “For what?” It returned to me with “loving me” written on it. Since then, I try my best to 11half notice my family members any more. Kevin and I have a closer 12  now, and sometimes when one of us notices that the other is upset we'll smile and say “Write it on a paper cup.”