Background intensity should be measured on each sample for each element but, if not practicable, e.g. in multi-channel instruments, then a close approximation of this intensity can be calculated from the mass absorption coefficient.Calibration has been made using chemicals added to cellulose and ...
原子质量表(talbe of atomic masses)
试题来源: 解析 A 选项A中的质子和中子位于原子核内,构成了原子的主要质量,而电子的质量极小,可忽略不计。原子质量数即质子数与中子数之和。选项B和C错误地包含了电子,而选项D虽然所有粒子都包含,但电子贡献微乎其微,因此正确答案为A。反馈 收藏
mass o f on e atom o f th e element averag e mass o f on e atom o f th e element D$$ \frac { a v e r a g e m a s s o f o n e a t o m o f t h e e l e m e n t } { \frac { 1 } { 1 2 } \times a v e r a g e m a s s o f o n...
Atomic mass unit (AMU) 1/12 the mass of a neutral atom of 12C, equal to 931.5 MeV. Atomic number (Z) Integer equal to the number of protons in a nucleus; the order of an element in the periodic table. Atomic weight or nuclear mass number (A) An integer equal to the sum of the...
Atomic mass number of an element is 232 and its atomic number is 90. The end product of this radiaoctive element is an isotope of lead (atomic mass 208 and at
1. The relative atomic mass of an element is always D I A the mass of an atom of the element relative to %2 the mass of a carbon-12 atom. B the mass of an atom of the element relative to the mass of a hydrogen atom.■ C the weighted mean mass of an atom of the element ...
百度试题 结果1 题目13 Parts per million is used to express the(2)(1) atomic mass of an element(2) concentration of a solution(3) volume of a substance(4) rate of heat transfer 相关知识点: 试题来源: 解析 (2) 反馈 收藏
To find the atomic mass of an element given the weight of one atom, we can use the relationship between the mass of a single atom and the number of atoms in one mole (Avogadro's number). Here’s how to solve the problem step by step:1.
结果1 题目 1 An atom of an element has an atomic number of 6 and a mass number of 12.(a)Using this information, complete the table to show the numbers of protons,neutrons and electrons in one atom of this element.(2)number of protons number of neutrons number of electrons(b)The ...