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

What is the atomic number of an element?ps:Please answered in English 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.. 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 谁能帮我做这两道英语科学题?.1.explain the layout of the periodic table.includ these words:groups,periods,atomic number,metals non-metals,metalloids and noble gases.2.plutonium has an atomic number of 94.explain why there are no naturally 求助：the absorption of a multiple atomic beam 怎么翻译? Write the quantum numbers of 3p atomic orbitals SAT2 which of the following radioactive processes when occurring separately ,must alter the atomic number of the radioactive nucleus?1,alpha decay2,beta decay3,gamma decayA,1B,2C,3D,1,2F,1,2,3 atomic mass跟atomic number的詳細介紹 考試用 200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons = a number of the number of the number of,a small number of,a number of. the number of造句 the number of造句 the reciprocal of number the number of中文 the number of 是什么意思? the number of同义词