[Answer] How can you find the mass number?

Answer: Protons plus Neutrons

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How can you find the mass number? The mass number gives an estimate of the isotopic mass measured in atomic mass units (u). For C the isotopic mass is exactly 12 since the atomic mass unit is defined as 1/12 of the mass of C. For other isotopes the isotopic mass is usually within 0.1 u of the mass number. For example Cl (17 protons and 18 neutrons) has a mass number of 35 and an isotopic mass of 34.96885. The difference of the actual isotopic mass minus the mass number of an atom is known as the mass excess which for Cl is –0.0311… Sep 04 2007 · Mass number The mass number also called the nucleon number is the number of protons and neutrons in an atomic nucleus. The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol. For example carbon-12 (12 C) has 6 protons and 6 neutrons. Mass spectrum - Wikipedia Mass number - Wikipedia Mass number - Wikipedia Negative mass - Wikipedia X-axis: m/z (mass-to-charge ratio) The x-axis of a mass spectrum represents a relationship between the mass of a given ion and the number of elementary charges that it carries. This is written as the IUPAC standard m/z to denote the quantity formed by dividing the mass of an ion by the unified atomic mass unit and by its charge number (positive absolute value). The mass attenuation coefficient or mass narrow beam attenuation coefficient of the volume of a material characterizes how easily it can be penetrated by a beam of light sound particles or other energy or matter. In addition to visible light mass attenuation coefficients can be defined for other electromagnetic radiation (such as X-rays) sound or any other beam that can be attenuated. To find the percent of aggregate passing through each sieve first find the percent retained in each sieve. To do so the following equation is used %Retained = ×100% where W Sieve is the mass of aggregate in the sieve and W Total is the tota...

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