How many neutrons does element X have if its atomic number is 39 and its mass number is 79?
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Given:
Atomic Number = 39
Mass Number = 79
Determine the number of neutrons of the element X
Solution:
In order to determine the number of neutrons of the element x, we simply needed to so use the formula for finding the number of neutrons.
Number of Protons = Number of Electrons = Atomic Number
Mass Number = Number of Protons + Number of Neutrons
Number of Neutrons = Mass Number - Number of Protons
Number of Neutrons = 79 - 39
Number of Neutrons = 40
Final answer:
The number of neutrons from element x is 40.