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Sodium-24 is a radioisotope of the chemical element sodium, which, in addition to the element-specific 11 protons, has 13 neutrons in the atomic nucleus, resulting in the mass number 13.
Fill in the isotope names and any missing information, including isotope numbers from the chart. Use your periodic table and the information provided.
Na is the only stable (and the only primordial) isotope. It is considered a monoisotopic element and it has a standard atomic weight of 22.989 769 28 (2). Sodium has two radioactive cosmogenic isotopes (22 Na, with a half-life of 2.6019(6) years; [nb 1] and 24 Na, with a half-life of 14.9560(15) h).
Many elements have a number of isotopes. Define the term isotope. (2) Complete the following table. (22) Calculate the average relative atomic mass of Ni to two decimal places. (2) The results taken from a mass spectrum of chlorine gas show peaks at m/z 35.00 and m/z.
Argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40. Based on argon’s reported atomic mass, which isotope exist as the most abundant in nature? Explain. Copper exists as a mixture of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu.
Learn about isotopes using real examples and real data, including comprehensive isotopic data of the first twenty chemical elements in the periodic table (hydrogen to calcium). Teachers can use the accompanying worksheet, in sections or in its entirety, to develop student literacy, numeracy, critical and creative thinking and ICT skills.
2 sie 2005 · Tenth Value Thickness for average gamma: Lead = 4.4 cm Detection Information: Usable Detectors listed with estimated efficiencies (Use efficiencies listed on instrument when available) Ludlum 3 with pancake probe at 1 cm: 13 % Liq. Scint. Counter: 85 % Ludlum 3 with NaI probe near surface: <1 % Gamma Counter: 5 % Action Quantities:
