Use your periodic table to complete this atomic model of Beryllium (Be). Neutrons are blue. Protons are red. Electrons are green. Look at how many protons, electrons, and neutrons are already in the model. What needs to be added to complete this model of a Beryllium (Be) atom? This model contains two electrons, three neutrons, and four protons. Choose all that apply. A. 1 more proton. B. 2 more neutrons. C. 3 more electrons. D. 2 more electrons. E. 1 more neutron.

Answer 1

To complete the atomic model of Beryllium (Be):

1. Protons: Beryllium has an atomic number of 4, meaning it has 4 protons. In the model, you already have 4 protons, so no additional protons are needed.

2. Neutrons: The most common isotope of Beryllium (Beryllium-9) has 5 neutrons (9 - 4 = 5). In the model, you currently have 3 neutrons, so you need to add 2 more neutrons (5 - 3 = 2).

3. Electrons: A neutral atom has the same number of electrons as protons. Since you have 4 protons, you need 4 electrons. The model currently has 2 electrons, so you need to add 2 more electrons (4 - 2 = 2).

So, the correct options to complete the model of Beryllium would be:

• B. 2 more neutrons
• D. 2 more electrons

Thus, the answers are B and D.