What is the atomic number of an element?ps:Please answered in English

What is the atomic number of an element?ps:Please answered in English 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 Atomic The atomic mass of copper is 63.55 amu.There are onlytwo isotopes of copper,63Cu with a mass of 62.93 amu and65Cu with a mass of 64.93 amu.What is the percentageabundance of each of these two isotopes? 200分求一道物理题 懂英文的神人 If sodium (Na),with an atomic weight of 23,combines with oxygen (O),with an atomic weight of 16,to from the compound Na2O,what is the ratio of the mass of sodium to oxygen that you would expect to react com the only sort of power they will use in the future is atomic power 英语翻译the scientist I admire most is Zhu Guangya,one of the founders of china's atomic bomb,missile and satellite.He was born in december 1924 in wuhan city ,hubei province.He was major in physics in his university studying and studied atomic n atomic spectra explain the theory..in chinese The atomic number of an element X is 15.The number of electrons in an anion of X is?但是eleltrons不是等同atomic number吗?A 10B 12C 15D 18 an element is a substance , all of _______ atoms have the same atomic number为什么选whose ? 请高手讲讲.. The atomic structure is ,as it were ,a miniature solar system.为什么填as it were呢? why is this the relative atomic mass of chlorine not a whole numberplease answer it in english what is the last letter?J A S O N 【计算机英语】The fact that I think the method is atomic signals that ...The fact that I think the method is atomic signals that we should use a Service [Evans DDD] instead to make the whole thing more explicit.The Service could check the curr what is the date what is the meaning? What is the matter? what is the story