If an element has a mass number of 4 and an atomic number of 2 how many neutrons does the element have?

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Why is the atomic mass of an element not given as a whole number when the protons and neutrons are whole numbers?

When you determine the atomic weight of an element you are taking the average weight of a mole of such atoms. Mole = 6.022 × 10 23 of anything. (A mole is a measurement of

What element has one neutron and a mass number 2?

The mass number is the sum of the number of neutrons and protons. If we already know that there is one neutron and the mass number is two, then that means there is one proton.