问题
选择题
原子序数为94的钚(Pu)是一种核原料，该元素一种原子的质子数和中子数之和为239，下 列关于该原子的说法不正确的是 ( )
A．中子数为145
B．核外电子数为94
C．质子数为94
D．核电荷数为239
答案
答案：D
题目分析：在原子中原子序数=质子数=核外电子数=核电荷数；质子数+中子数=相对原子质量，故选D
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原子序数为94的钚(Pu)是一种核原料，该元素一种原子的质子数和中子数之和为239，下 列关于该原子的说法不正确的是 ( )
A．中子数为145
B．核外电子数为94
C．质子数为94
D．核电荷数为239
答案：D
题目分析：在原子中原子序数=质子数=核外电子数=核电荷数；质子数+中子数=相对原子质量，故选D
Leadership is a difficult concept to explain because everyone defines it differently. From my personal experiences as a student leader, I can tell you that there is no single ___小题1:___of leadership, ___小题2:___with students leaders. You are a leader, a student and a peer, so this role can be especially difficult to manage. As a student leader,you deal with academic__小题3:___,as well as added pressure of leading group of your peers. As, the president of Fuse, the contemporary dance group at Colgate University, I experienced many ups-and-downs with___小题4:__. Thankfully, my passion for this dance club gave me the ____小题5:___to lead my fellow dancers. Finding an activity that is both enjoyable and __小题6:___is the first step. In order to be a good leader, you must be personally interested in what you are leading, whether it's debating,cooking or robotics. In my case, dance has always been of interest to me, from my grandfather teaching me salsa to early childhood training with ballet, and so I always that dance would be part of my life. Once I arrive on my college campus, ready for my college adventure, I had a sudden ___小题7:___: wandering around the Student Activities Fair, I saw no contemporary or modern dance clubs I panicked. After meeting a fellow dancer at Freshmen Orientation, we found that we shared the same passion and desire to start a club. We held auditions,created club____小题8:___and held practices. The process of creating the actual club was both fun and challenging because we had to figure out school club regulations, __小题9:__many club rules, obtain 60 signatures of supporters and overcome other obstacles. As it turns out, this process was not a walk in the park for us. |