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
Atoms are the fundamental units of matter, and atoms are composed of three subatomic particles: protons, neutrons, and electrons. An atom's structure consists of a central nucleus and an outer cloud-like field that orbits the nucleus. Answer and Ex...
How many 3d electrons are found in the below element? nickel, Z = 28. A monatomic ion has a charge of +1. The nucleus of the ion has a mass number of 85. The number of neutrons in the nucleus is 1.30 times that of the number of ...
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