A. different B. similar C. same D. opposite 相关知识点: 试题来源: 解析 B。“Elements in the same group have similar chemical properties.”可知同一组的元素有相似的化学性质。A 选项不同的、C 选项相同的、D 选项相反的均不符合语境。反馈 收藏 ...
试题来源: 解析 D。解析:文章中明确提到“The elements in the same group have similar chemical properties. This is because they have the same number of valence electrons.”,即同一族的元素具有相似的化学性质是因为它们有相同数量的价电子。反馈 收藏 ...
If r 1 , r 2 are an elements of F /[ N , N ] and, for some positive integer d , r 1 d is in the normal closure of r 2 d in F /[ N , N ], then r 1 is in the normal closure of r 2 in F /[ N , N ]. Let F / N be a soluble group; r an element of F...
In year 1817 ___ tried to sort the elements with the same properties in groups. View Solution Two elements that have similar properties because they have the same number of valence electrons are View Solution Exams IIT JEE NEET UP Board...
depend on the outer shell of electrons of the atoms. Most pupils will be able to (Further): Explain how properties of the elements in Group 1 depend on the outer shell of electrons of the atoms. Some pupils will be able to (Challenge): Predict properties from given trends down the ...
5 This question is about Group I elements.(a) The properties of some Group I elements are shown in the table.element melting point boiling point relative thermal atomic in C in C conductivity radius/pm lithium134284152000000 00000000sodium97883142186potassium63760102… ……rubidium3968658248(i) Complet...
Elements in the same group often have similar chemical properties ___ they have the same number of valence electrons. A. because B. so C. but D. or 相关知识点: 试题来源: 解析 A。因为同一组的元素具有相似的化学性质是因为它们有相同数量的价电子,所以用 because。
The properties of group 2A elements are that they are fairly reactive. They form cations readily by losing 2 electrons from their outermost shells. What family of elements does group 2 correspond to? Group 2 of elements on the periodic table refers to alkaline earth metals. They are beryllium...
It isn’t the same bus that we usually see on the street. It looks like a panda with black ears and black eyes.After getting on the bus, people only need to buy their tickets by scanning (扫描) their hands! About one minute later, the bus starts its self-driving mode (模式). It...
2 The table shows some physical properties of the Group Vll elements.melting point boiling point atomic radius halogen/℃/℃/nanometres colour fluorine-220-188pale yellow chlorine-101-350.099bromine-7+590.114red-brown iodine+114+1840.133grey-black(a) Use the information in the table to explain wh...