Write the complete symbol, including the mass number and atomic number, for an atom that contains 28 protons and 30 neutrons. Write the complete symbol, including the mass number and atomic number, for each atom. a. cont...
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