What is the symbol for the element that is in groupIB(11)and period4? What is the symbol for the element that is in group IIA(2)and period5?
What is the symbol for the chemical element hydrogen? An atom with a positive charge has Where does the word hydrogen come from? What is an example of a hydrogen bond? What is the charge of halogens? What is the charge of potassium?
Which element has the atomic number 9? Which element has atomic number 13? What does the atomic number of an element represent? What is the name of the element that has an atomic number of 8? What is the symbol for the element with atomic number 74?
in the periodic table of elements which symbol has 41 electrons? What are the examples of metals, non-metals, and metalloids? What are examples of metals non-metals and metalloids? Which of the elements in the following periodic table are halogens?
aThe four-footed furry creature,symbolizing endurance,beauty,peace and hope,sits in fourth position on the Chinese calendar. 四脚毛茸的生物,象征耐力,秀丽,和平和希望,在第四个位置在中国日历坐。 [translate] a真的很对不起,打扰你。 Really very much sorry, disturbs you. [translate] a我们才能真正做...
Not only the Great Wall was the Chinese ancient times great project, also was the construction which shared the honor with the Egyptian pyramid.Not only the Great Wall is the China most important historical relics, moreover has become the Chinese nation the symbol.[translate] ...
23K What is helium used for? Learn about chemical element helium and its uses. Understand the chemical symbol for helium, its origin name, and find out whether helium gas is a pure substance or not. Related to this QuestionWhat is the mass number of helium? What is the density of nitr...
Bromine’s chemical symbol is Br and is part of the halogen group of the periodic table. The bromine substance Br2 is a reddish-brown liquid and is never naturally found in its elemental form but rather in inorganic compounds, also known as bromides, and in natural organo-bromine compounds....
Theatomic numberof fluorine is nine, and the element belongs to the halogen group. It is the lightest of the halogen gases, and the most reactive naturally occurring element, due to its electronegative configuration. On the periodic table of elements, fluorine is identified with the symbol F. ...
That is to say, when you are trying to find the main idea, you are actually thinking about gives the purpose of given paragraph: Is it to inform you about something, to explain, to narrate? Or is it to compare, to argue, to persuade, etc.? When you get the...