Twitter Google Share on Facebook the present or current time, as distinguished from all other times. See also:Period Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co. Want to thank TFD for its existence?Tell a friend about us, add a link to this page, or ...
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。反馈 收藏
1 length of time时间长度PERIOD OF TIMEa particular length of time with a beginning and an end一段时间;时期 Tomorrow’s weather will be dry with sunny periods. 明天天气干燥,间或晴朗。 period of His playing improved in a very shortperiod of time. ...
Aperiodin theperiodic tableis anyhorizontalrow ofelements. Each elements in the same period has one more proton than the one to its left. This means itsatomic numberis one number higher. The elements in the same period are very metallic on the left and nonmetallic on the right. The smaller...
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 ...
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.
1)This question is about the Periodic Table.a) How many elements are there in period 3 of the Periodic Table?(1)b)Place the first 3 elements of period 3 in order of increasing reactivity.(1)c) Explain your reasoning to part (b).(1)d) Mark with an × the statement that best ...
: a series of elements of increasing atomic number as listed in horizontal rows in the periodic table Medical Definition period noun pe·ri·od ˈpir-ē-əd 1 a : a portion of time determined by some recurring phenomenon b : a single cyclic occurrence of menstruation 2...
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Now, a reinterpretation of the relationship of the first-period elements to successive elements may help make the eight-period table an attractive choice for the 21st century.doi:10.1007/s00897010515aGary Katz1. Periodic Roundtable, Cabot, VT, 05647 ;...