Question

24 how many neutrons does beryllium - 9 have? (1 point) 4 6 5 9

Explanation:

Step1: Recall the formula for number of neutrons

Number of neutrons \(N = A - Z\), where \(A\) is the mass number and \(Z\) is the atomic number.

Step2: Identify \(A\) and \(Z\) for Beryllium - 9

For Beryllium - 9, \(A=9\). From the periodic table, the atomic number of Beryllium \(Z = 4\).

Step3: Calculate the number of neutrons

Substitute \(A = 9\) and \(Z=4\) into the formula \(N=A - Z\). So \(N=9 - 4=5\).

Answer:

C. 5