The number of neutrons for 9Be4 is 5.
What is a neutron?
A neutron is a subatomic particle that has a neutral charge.
It has a mass slightly greater than the proton.
To calculate the number of the neutron, subtract the mass of the element with the number of protons of the element.
So, the atomic mass of beryllium is 9 and the number of protons it has is 4
9-4 = 5
Thus, the number of protons present in 9Be4 is 5.
Learn more about neutrons, here:
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