21 Element X is in Group ll of the Periodic Table.Which statements about X are correct? A1 X is a metal.2 X has two electrons in its outer shell.3 X is a liquid at room temperature. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 相关知识点: 试题来源:...
Element Family Element families are elements that have the same number ofvalence electrons. Most element families are a single column of the periodic table, although the transition elements consist of several columns, plus the elements located below the main body of the table. An example of an e...
The element with the symbol 'K' is in which period of the periodic table? A. Period 1 B. Period 2 C. Period 3 D. Period 4 相关知识点: 试题来源: 解析 C。解析:元素符号为“K”的钾元素位于周期表的第三周期。第一周期元素为氢、氦,第二周期元素为锂、铍等,第四周期元素有钾之后的钙等...
More so than any of the other major groups of elements in the periodic table, the transition metals have shaped human history and have been the workhorses of industry. The discovery of metallic copper ended the Stone Age and ushered...
Element Copernicium of the Periodic Table,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工商银行等数万家企业
The Periodic Table of Elements: Element Name Origins (元素周期表每个元素名称的来源,大图请戳http://t.cn/R5Xhzsk)
Identifying Element Blocks on the Periodic Table One way to group elements is by element blocks, sometimes known as element families. Element blocks are distinct from periods and groups because they were developed based on a very different way of categorizing atoms....
1 Cobalt is an element in Period 4 of the Periodic Table.(a)Use your copy of the Periodic Table to help you complete the table below.number of number of number of particle protons neutrons electrons Co Co2+2(b)60Co is a cobalt isotope.(i) Explain the term isotope.2(ii) Explain why...
A. the number of protons an element has B. the number of neutrons an element has C. the number of electron shells an element has D. the number of E. lectrons an element has 相关知识点: 试题来源: 解析 C。解析:The periods represent the number of electron shells an element has.反馈...
15 Rubidium is an element in Group I of the Periodic Table. Which one of the following statements about rubidium is incorrect? D A Rubidium has a low density. B Rubidium is soft and can be cut with a knife.C Rubidium reacts explosively with water to form an alkaline solution.D Rubidium...