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。
properties.This is because their atoms contain the same number of(1) A protons□ B neutrons C electrons in the outer shell D protons and neutrons(b)The elements in the periods of the Periodic Table show a change in properties across the period from left to right.The table gives information...
ICSE-PERIODIC PROPERTIES OF ELEMENTS -QUESTIONS FOR PRACTICE ( Fill in the blanks by using correct word/term given in the brackets and rewrite the complete sentence in your notebook.) Period 1 contains elements. (two/eight) 01:44 The elements in a period have valencies. (same/different)....
1. What are the general properties of metals and where are they found in the periodic table? 2. What are the general properties of nonmetals and where are they found in the periodic table? Which element would have physical and chemical properties similar to ...
Thus it is possible to arrange the list of elements in tabular form with elements having similar properties placed in vertical columns. Such an arrangement is called a periodic table. 早在 17 世纪末期,罗伯特•波义耳就开始了这项工作,他提出了现在公认的元素概念,大量的研究使 我们对元素极其化合物...
How do metals and nonmetals differ in physical properties? What property of a chemical element makes it unique? What is calcium's state of matter at room temperature? What are two properties of covalent compounds? What do the elements in the same period have in common? What are the Group ...
Periodic table - Elements, Properties, Periodicity: The periodicity of properties of the elements is caused by the periodicity in electronic structure. The noble gases are chemically unreactive, or nearly so, because their electronic structures are stabl
Periodic properties and their trends The periodic properties may be defined as: The properties of the elements are directly or indirectly related to the electronic configuration of their atoms and show gradation (increases or decreases) in moving down a group or a longer period. ...
When Dmitri Mendeleev drew up the periodic table, he grouped elements of similar properties. Based on the number of electrons, a scientist can determine which group to place an element into.This pattern is called a period(or row) on the periodic table. ...
Elements in the same group in the periodic table (a) have similar chemical properties. (b) are called isotopes. (c) have consecutive atomic numbers. (d) make up a period of elements.What are the electron configurations of Na^+, Cl^-, a...