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?The center, ___ nucleus, of an atom contains positively charged particles called protons.? A.and B.or C.but D.for? 正确答案:B解析:??B、这句话中的center和nucleus两词根据意思表达同位关系,使用or完成,译为“即” 5 单选(1分) 读者学会这些基本概念很重要,否则后面内容的讨论理解起来会有...
It takes 1000 little pieces to show every known atom in the universe and at the end of this year I’ll have 1096… May 7, 2016My Year In Photos Photos My Year In Pictures: April Week 3 My last set of photos was really a random, disconnected glimpse into our mid-April but this...
A key feature of Bohr’s model is that each of the permitted electron orbits around a given atom has a certain energy value; we therefore can think of each orbit as anenergy level. To move from one orbit to another (which will have its own specific energy value) requires a change in ...
The Fourier component of the potential energy of interaction of an atom with an atom has the form of a polynomial of the fourth degree of the atomic form factor. Numerical calculation is performed for the atomic form factor in the approximation of hydrogen-like wave functions, which approximate...
Which statements about an atom of cobalt-60 are correct?1. It contains 33 neutrons.2. Its nucleus has a relative charge of 27+.3. It has a different number of neutrons from the atoms of other isotopes of cobalt.(A) 1, 2 & 3 are correct....
Discovery of the atom It has been known that elements are broken down into basic units of a given weight since the early 1800s, in an insight that came from the English scientist John Dalton. He considered these units to be fundamental, indivisible particles, hence his use of the Greek wor...
a subatomic particle with a positive electrical charge. Rutherford proposed a model of the atom with a dense, positively chargednucleus at its center, orbited by negatively charged electrons. However, this model presented a problem. The positively charged protons in the nucleus should all repel eac...
百度试题 结果1 题目A___ has taught us what atoms are made up of and how powerful the atom bomb is. A. seaman B. salesman C. naturalist D. scientist 相关知识点: 试题来源: 解析 D