百度试题 结果1 题目6 An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.What is Q? B A calcium B potassium C strontium D yttrium 相关知识点: 试题来源: 解析 B 反馈 收藏
What element has 6 valence shell electrons and 16 protons? What is the valence shell? a. It is the shell of electrons in an atom that is the least reactive. b. It is the outermost shell of electrons in an atom. c. It is the last partially fill...
no. 6, i.e., all having 6 protons in the nucleus; any atom with at. no. 6 is a carbon atom. By 2016, 118 elements were known, ranging from hydrogen with an at. no. of 1 to oganesson with an at. no. of 118. (See the table entitled Elements for an alphabetical list of all...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23
An element is a substance made up of only one type of atom, all with the same number of protons. Gold offers a good example. A piece of jewelry fashioned out of pure gold would be made of millions upon millions of atoms, each having exactly 79 protons in its nucleus. ...
该元素 X 有三种同位素: X 221、 X-220 和 X-218、 群众 220.9、 220.0 和 218.1 amu。这三种同位素的相对丰度分别 74.22%、 12.78%和为 13.00%。计算 X 元素的原子质量。 翻译结果4复制译文编辑译文朗读译文返回顶部 的因素有三个同位素X:X-221、X-220、和X-218,与群众220.9、220.0、218.1阿拉伯马格里布...
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Isotopes are atoms of the same element (that is, with the same number of protons in their atomic nucleus), but having different numbers of neutrons. Most (66 of 94) naturally occurring elements have more than one stable isotope. Thus, for example, there are three main isotopes of carbon....
Name an element in the third period of the periodic table with 3 valence electrons. Name an element in the third period (row) of the periodic table with three valence electrons. Use the periodic table to determine the numbers of protons, neutrons, ...
Electrical machines and apparatus, having individual functions, n.e.s. in chapter 85 and parts thereof Commodity code: 85 438543 Electrical particle accelerators for electrons, protons, etc. (excl. ion implanters for doping semiconductor materials) Commodity code: 85 43 10854310 ...