百度试题 结果1 题目There are ___ periods in the periodic table. A. 7 B. 8 C. 9 D. 10 相关知识点: 试题来源: 解析 A。目前元素周期表有 7 个周期。反馈 收藏
In the periodic table, there is an element whose English name starts with 'H' and it is the lightest element. What is its chemical symbol? A. He B. H C. Hg D. Ho 相关知识点: 试题来源: 解析 B。解析:英文名称以'H'开头且是最轻的元素是氢(Hydrogen),其化学符号是H。He是氦(Helium)...
百度试题 结果1 题目The rows in the periodic table are called ___. A. groups B. periods C. elements D. properties 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“The rows are called periods.”。
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....
A. groups B. periods C. elements D. compounds 相关知识点: 试题来源: 解析 B。本题考查元素周期表的基本结构知识。元素周期表的水平行称为周期(periods)。选项 A“groups”是指族;选项 C“elements”是元素;选项 D“compounds”是化合物。反馈 收藏 ...
In the periodic table, which group of elements is known for their ability to form multiple oxidation states? A. Group 1 B. Group 2 C. Group 13 D. Transition metals 相关知识点: 试题来源: 解析 D。解析:过渡金属以能够形成多种氧化态而闻名。第一主族元素通常只有一种氧化态(+1),第二主族...
百度试题 结果1 题目The horizontal rows in the periodic table are called ___. A. groups B. periods C. lines D. rows 相关知识点: 试题来源: 解析 B。周期表中的水平行被称为周期。A 选项族、C 选项线、D 选项行表述不准确。
then they died then they go to bed then they left a then they returned ev then they strode acro then they woke up then to the clock then took the other a then try to bring me then turn around and then turn his back then what is it then while we live then wind arose then write...
百度试题 结果1 题目The elements in the periodic table are arranged ___ a specific way. A. in B. on C. at D. by 相关知识点: 试题来源: 解析 A。“in a specific way”表示“以一种特定的方式”,是固定搭配。
百度试题 结果1 题目The symbol for gold in the periodic table is ___. A. Gd B. Au C. Ag D. Cu 相关知识点: 试题来源: 解析 B。在元素周期表中,金的符号是 Au。Gd 是钆,Ag 是银,Cu 是铜。