periodn(periodic table)SCSimplified Chinese周期zhōu qī TCTraditional Chinese周期 / 週期 The periodic table is made up of 9 horizontal periods. 化学元素周期表是由9个水平的元素周期组成的。 periodnrare(sentence)(罕见用法)SCSimplified Chinese完整句wán zhěng jù ...
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.
bout,round,turn- (sports) a division during which one team is on the offensive first period- the first division into which the play of a game is divided second period- the second division into which the play of a game is divided
词组短语: ❶periodic table 周期表 ❷periodic structure 周期性结构;周期组织 ❸periodic wave 周期波 例句: ❶Periodic checks are carried out on the equipment. 设备定期进行检查。 ❷This kind of periodic orbit is only a phase in a comet's life. 这种周期性轨道只是彗星生命中的一个阶段。 ...
In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in vertical columns. Elements of the same period have the same number of electron shells; with each group across a period, the elements have one more ...
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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.
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...
In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in vertical columns. Elements of the same period have the same number of electron shells; with each group across a period, the elements have one more ...
Period, in physics, the interval of time it takes for a motion to repeat. Such motion is called periodic motion and is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, Earth in its orbit around the