200分求一道物理题,求懂英文的高手来帮下忙A certain isotope has 80 protons and 122 neutrons in its nucleus.Identify the element involved and find the atomic and mass numbers.Atomic number=Mass number=

200分求一道物理题,求懂英文的高手来帮下忙A certain isotope has 80 protons and 122 neutrons in its nucleus.Identify the element involved and find the atomic and mass numbers.Atomic number=Mass number= 问一道物理题,求高手 一道科学物理题'求高手求过程'求答案'答得好的'追加分 200分求一道物理题,求帮助 各种求 懂英文的高手嘞Light with a wavelength of 544.6 nm strikes a single slit that is 0.4 mm wide. The diffraction pattern produced by the slit is observed on a wall a distance of 1.4 m from the slit. (a) 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 = “好与坏”连在一起的英文 求高手来帮翻译 200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21 求高手解答一道物理题要有公式和必要文字说明 求高手算一道 所得税 （英文） 一道微分方程求高手来做一下 求一道物理题 一道物理题,求思路 求问一道物理题 一道物理题,求思路 求一道物理题详解? 求解决一道物理题 求一道物理题、、、、初三 一道物理题,求理由!