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
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...
The meaning of PERIOD is the completion of a cycle, a series of events, or a single action : conclusion. How to use period in a sentence. Synonym Discussion of Period.
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.”。 反馈 收藏
题目The horizontal rows in the periodic table are called___. A. groups B. periods C. families D. series 相关知识点: 试题来源: 解析 B。元素周期表中的水平行称为周期。选项 A 组是垂直列;选项 C 家族不准确;选项 D 系列也不是水平行的正确名称。反馈 收藏...
What are the 7 periods on the periodic table? There are 7 periods on the periodic table, numbered down the left side of the table. These periods are named according to their numbers: period 1, period, 2, etc. What is the difference between a group and a period in the periodic table?
百度试题 结果1 题目The vertical columns 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 A。周期表中的垂直列被称为族。B 选项周期、C 选项线、D 选项行不符合要求。反馈 收藏 ...
What are the 7 periods on the periodic table? There are 7 periods on the periodic table, numbered down the left side of the table. These periods are named according to their numbers: period 1, period, 2, etc. What is the difference between a group and a period in the periodic table?
A. Groups B. Periods C. Elements D. Properties 相关知识点: 试题来源: 解析 B。原因:文章中明确提到“The horizontal rows or periods show how the properties of elements change as you move across.”,即水平行被称为 periods。反馈 收藏
a series of elements of increasing atomic number as listed in horizontal rows in the periodic table periods 例句 1.We have had two power failures in a five-month period. 2.He's only away for short periods, a week at the longest. ...