[Answer] One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

Answer: 18

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One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope? science answers. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. Kaedan_Heitkamp. Terms in this set (10) One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope ? 18. What is true about all uranium atoms? It determines the atomic mass of atoms. However while calculating the mass number the small contribution of mass from electrons is ignored. Mass number is equal to Number of protons + Number of neutrons Mass number = 11 + 7 = 18 . Hence the correct answer is 18. Since the atomic number of sodium is 11 the atom contains 11 protons and 11 electrons. The number of neutrons is determined by subtracting the atomic number … Tue Jun 26 2012 · sodium's atomic number is 11 and since protons and electrons are the same number as the atomic number there are 11 protons and 11 electrons to get...

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