1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?2.What is the charge in coulombs on an object that has(1)An excess of 6.25×10^19 electrons?（2）An deficiency of 1.0×10^8 electr

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1.Howmanyelectronshaveremovedfromapositivelychargedpith-ballelectroscopeifithasachargeof7.5×10^-11C?

1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?2.What is the charge in coulombs on an object that has(1)An excess of 6.25×10^19 electrons?（2）An deficiency of 1.0×10^8 electr
1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?
2.What is the charge in coulombs on an object that has
(1)An excess of 6.25×10^19 electrons?
（2）An deficiency of 1.0×10^8 electrons?

1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?2.What is the charge in coulombs on an object that has(1)An excess of 6.25×10^19 electrons?（2）An deficiency of 1.0×10^8 electr
1.一个电子电荷e=-1.6*10^-19C 验电器上移走的电子数=Q/e=7.5*10^-11/1.6*10^-19=46875*10^4
2.物体所带电荷等于多余或缺少电子的总电量
(1)多余电子带电荷Q=(-1.6*10^-19)6.25*10^19=-1.6*6.25C=-10C
(2)缺少电子带电荷Q=(1.6*10^-19)*10^8=1.6*10^-11C

How many electrons does a neurtral fluorine atom contain? How many electrons does ground-state Kr have with both n = 3 and l = How many valence(outer shell)electrons are present in the atoms of the element with atomic number51(about Chemistry) 1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?2.What is the charge in coulombs on an object that has(1)An excess of 6.25×10^19 electrons?（2）An deficiency of 1.0×10^8 electr 相对论部分 1.The total power radiated by the sun is about 3.83 x1026 Watts.How many kilograms of protons and electrons are transformed into helium every second?Note:For a fusion reaction the fraction of mass converted to energy is about 0.007.2. 英语懂的 来拿分 11.How many neutrons and pro tons are in an atom of phosphorus11.How many neutrons and pro tons are in an atom of phosphorus-31,atomic number 15,and determine how many electrons should be in the first,second,third,and fourth en how many how many, how many how 1.How many mother have 28 days 100分求一道物理题 If the mass of a hydrogen atom is 1.67*10^-27kg and the mass of an electron is 9.1*10^-31kg,how many electrons would be required to have a mass equivalent to one hydrogen atom? 关于配位体化合物的问题How many unpaired electrons are there in the hexabromomanganate(III) anion?在[Br6Mn]-3里有多少个未成对电子?a.1b.3c.5d.2e.4Mn失去的3个电子是和Br形成配位键了么？ 1.how many people in quebec? 2.how many people live?3.what important natural resources ? How Many Times,How Many Lies 歌词 ___ bananas do you need?1.how 2.how many 3.how much 4.what 几道英语化学题!1.how are the atomic numbers and the atomic masses of the elements related to how the elements are arranged on the periodic table?2.how does the number of electrons relate to the arrangement what is the different in the number o How many?的中文. how many的中文