an aluminum isotope consists 13 protons ,13 electrons,and 14 neutrons,it mass number is?13 14 27 40?

an aluminum isotope consists 13 protons ,13 electrons,and 14 neutrons,it mass number is?13 14 27 40? aluminum scarp spun aluminum Aluminum bracket 某元素的同位素偏转碳12原子的两倍多 什么可以推断该同位素的质量An isotope of an element is deflected twice as much as atom of carbon-12.Which can be deduced about the mass of that isotope? 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 = 里面的clean-up for the determination 具体什么意思?这句话什么意思?Ultrasonication extraction and gel permeation chromatography clean-up for the determination of polycyclic aromatic hydrocarbons in edible oil by an isotope dilution gas 100分求一道物理题,If aluminum (Al),with an atomic weight of 27,combines with oxygen (O),with an atomic weight 16,to form the compound aluminum oxide (Al2O3),how much oxygen would be required to react completely with 52g of aluminum 英语翻译1ST SHIELD:ALUMINUM-POLYESTER/EAA LAMINATEDTAPE WITH OVERLAP BONDED TO THE DIELECTRIC.ALUMINUM/POLYESTER/EAA TAPE IS AN ACCEPTABLE ALTERNATE.DIAMETER OVER TAPE:0.288 ± 0.002 (7.32 ± 0.05 MM) 英语翻译Aluminum alloy Track aluminum silicate是什么意思 aluminum nitrate是什么意思 anodized aluminum是什么意思 aluminum capacitor是什么意思 aluminum acetylacetonate是什么意思 brushed aluminum是什么意思 primary aluminum是什么意思 aluminum,heavy duty copper