Multiply number of x adn ave mass per x
Without additional information about the specific element in question, it's not possible to determine which isotope is more abundant solely based on the atomic masses. The abundance of isotopes depends on various factors such as stability and nuclear properties of the specific element.
If 42 is the atomic number then there is 42 electrons in isotope.
If you think to stable isotope Ca-135 this have 80 neutrons.
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The isotope has 20 protons and 24 neutrons. This isotope is called calcium-44, and it is a stable isotope of calcium.
For Ca isotope 40 it is 20 neutrons and 20 protons, but there are 5 other naturally occurring (>2%) Ca-isotopes with mass numbers ranging from 42 - 48. Remember: p + n = mass number, so n = m - p
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The mass number of an isotope is the sum of its protons and neutrons. Calcium (Ca) has an atomic number of 20, meaning it has 20 protons. If the isotope has 24 neutrons, the mass number would be 20 protons + 24 neutrons = 44. Therefore, the mass number of this calcium isotope is 44.
abundance of uranium in the earth crust; 2,5-3 ppm (mg/kg) abundance of uranium in the sea water: ca. 3 ppb (?g/kg)
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An isotope has extra/fewer neutrons than the original atom. So if you know the isotope you can deduce the original atoms' formula.For Ca that would be:20 protons40 mass number
42 total mass -20 protons = 22 neutrons