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34kurt
3 years ago
11

How many neutrons does element x have if it’s atomic number is 40 and it’s mass number is 82?

Physics
1 answer:
Black_prince [1.1K]3 years ago
4 0
The atomic number gives you the number of protons element x has. Since the mass of protons and neutrons are almost similar(around 1 amu), the mass number can be thought of as the sum of protons and neutrons. so if element x whose atomic number is 40 has a mass number of 82, then we know that 42 of those must be neutrons.
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