Question

bohr diagram
lewis structure
be

Explanation:

Step1: Determine the number of protons (P)

The atomic number of an element is equal to the number of protons. For Beryllium (Be), the atomic number is 4. So, \(P = 4\).

Step2: Determine the number of neutrons (N)

The mass number is given as 9. The formula for mass number \(A\) is \(A=P + N\). Rearranging for \(N\), we get \(N=A - P\). Substituting \(A = 9\) and \(P = 4\), we have \(N=9 - 4=5\).

Step3: Determine the number of electrons (E)

For a neutral atom, the number of electrons is equal to the number of protons. Since \(P = 4\), \(E = 4\).

Answer:

\(P = 4\), \(N = 5\), \(E = 4\)