百度试题 结果1 题目10 An isotope of element Y has 19 protons and 20 neutrons in its nucleus. Which is the symbol for the ion of Y? B2039A YB19192039C YD1919 相关知识点: 试题来源: 解析 B 反馈 收藏
The resulting atom: 1) must be very reactive chemically 2) has an atomic number that is one more than that of X 3) has a mass number that is one less than that of X 4) must be radioactive 5) is the same chemical element as X Q13) Radon-222 is a gas produced by alpha decay....
- The element uranium having the atomic number Z = 92 have been irradiated with many slow neutrons and many new radioactive elements up to Z = 112 and earlier it has been named as ununbium but now its names have been discovered and is now as Copernicium (Cn)...
An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. The number of protons determines the element of the atom, while the number of neutrons can vary. Electrons exist in energy levels or shells around the nucleus. 开学特惠 开通会员专享超值优惠 助力考试高...
a有 但是 是坏的 But has is bad[translate] a也就是说铁元素原子核中的中子与质子要比其它所有元素原子核中的中子与质子靠近得更紧密,其中子与质子间的强相互作用力也最大,因而当其向同一个方向排列时,其也具有最大的磁场。 In other words, in the hard element atomic nucleus neutron and the proton ...
The period of an element with electron configuration 1s2 2s2 2p6 3s2: a. 3. b. 1.How many electrons can be in the n=6 l=2 subshell?A neutral atom of an element has 2K, 8L, 9M, and 2N electrons. Find out the following: (a) Atomic number (b...
Which has the largest relative mass? The nucleus of an atom is composed of uncharged particles as well as which of the following? A. Protons B. Neutrons C. Electrons D. Positrons The smallest particle of an element that retains the characteristics of the ele...
If carbon has an atomic number of 6, and a mass number of 14, how many neutrons are in the atom?Which of the following facts allows you to determine that atom A and atom B are isotopes of the same element? a) They each have 6 protons. b) They each have 4 ...
甲供应商向同一项目中的乙、丙两家专业分包单位供应同一型号材料，两份供货合同对材料质量标准均未约定。乙主张参照其他企业标准，丙主张执行总承包单位关于该类材料的质量标准，甲提出以降低价格为条件，要求执行行业标准，乙、丙表示同意，则该材料质量标准应达到( )。
The most striking of these non-classical phenomena is quantum entanglement (QE), which has been the most debated element of quantum mechanics ever since the theory was formulated about 100 years ago. QE (see e.g., [3]) is the phenomenon that two or more particles can exist in a shared...