Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?(1 point)Responses44559913

Answer 1

To determine the number of neutrons in an isotope, you can use the formula:

\[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \]

For beryllium-9:

• The mass number is 9 (the number in the isotope name).
• The atomic number is 4 (the number of protons in beryllium).

Now, calculate the number of neutrons:

\[ \text{Number of Neutrons} = 9 - 4 = 5 \]

So, the isotope beryllium-9 has 5 neutrons.