Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?(1 point) Responses 13 13 4 4 9 9 5

Answer 1

The isotope beryllium-9 has an atomic number of 4, which means it has 4 protons. The mass number of beryllium-9 is 9. To find the number of neutrons, you subtract the number of protons from the mass number:

Number of neutrons = Mass number - Number of protons
Number of neutrons = 9 - 4
Number of neutrons = 5

So, beryllium-9 has 5 neutrons. The correct response is 5.