Periods in the periodic table run horizontally and indicate the number of electron shells; Groups run vertically, representing elements with similar chemical properties and the same number of electrons in their outer shell.
Learning about these things helps us better understand the world we live in. But have you ever noticed something missing in the periodic table? There were already 114 elements. But the seventh row of the table was not f (5) , until now! In December, scientists from IUPAC(国际理论与应用...
aon descending a group in the periodic table such as lithium,sodium,potassium,rubidium,caesium,the size of the atoms increases due to the effect of extra shells of electrons being added;this outweighs the effect of increased nuclear charge 在周期表里下降一个小组例如锂,钠,钾,铷,铯,原子增量的...
求翻译:In the periodic table, the halogens include Cl, Br, and I, and the alkali metals include Na, K, and Rb. These elements within each group exhibit similar but not identical chemical properties.是什么意思?待解决 悬赏分:1 - 离问题结束还有 In the periodic table, the halogens include ...
根据文中Scientists are still looking for ways to use these elements, and other elements in the elements in the eighth row, in our daily lives.可知这些新元素并不能广泛的应用于生活中,故选C。 根据文中But for now, be careful when you read your science books because the periodic table might ...
Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in t
Mendelyeev's periodic table 门捷列夫周期表 group in periodic table 周期表属 periodic table 周期表 periodic table of elements 元素周期表 periodic table of (chemical) ele ments 【化】 元素周期表 unknown periodic component(s) 未知周期分量 Mendeleev's periodic system 门捷列夫周期系 periodic ...
百度试题 结果1 题目25 Selenium, Se, is in the same group of the Periodic Table as sulfur, S What is the formula of sodium selenide? A ANa2Se BNaSeO C Na2SeO D Na SeO: 相关知识点: 试题来源: 解析 A 反馈 收藏
aCertain groupings of elements in the periodic table are designated by special names. The heavy, stepped, diagonal line on the table divides the elements into two major classed. Those to the left of the line are called metals, and those to the right, nonmetal. GroupⅠA elements are known...
stand firm not moving stand in a line stand in different sh stand in uptodate soc stand iron piles stand mat--colorsblac stand on one legandba stand on ones own fee stand set-back area stand tall on stage stand up for someone stand-alone asynchron stand-alone system si stand-along pv ...