Using the model of Beryllium below, identify what particle is shown in red.

• Electrons

• Protons

• Neutrons

• None of the above

Using the model of Beryllium below, identify what particle is shown in grey.

• Electrons

• Protons

• Neutrons

• None of the above

Using the model of Beryllium below, identify what particle is shown in yellow.

• Electrons

• Protons

• Neutrons

• None of the above

Looking at the model of Beryllium, explain what the mass number for this atom. Give evidence to support your answer.

• The mass number is 4 because there are 4 protons in the nucleus.

• The mass number is 9 because there are 4 protons and 5 neutrons in the nucleus.

• The mass number is 13 because there are 4 protons, 5 neutrons, and 4 electrons in the atom.

• The mass number cannot be determined from the model.

Looking at the model of Beryllium, explain what the atomic number is for this atom. Give evidence to support your answer.

• The atomic number is 4 because there are 4 protons in the nucleus.

• The atomic number is 9 because there are 4 protons and 5 neutrons in the nucleus.

• The atomic number is 5 because there are 5 neutrons in the nucleus.

• The atomic number is 4 because there are 4 electrons in the electron cloud

How many electron shells (energy levels) does the atom Potassium (K) have?

• 2

• 3

• 4

• 5

How many electron shells (energy levels) does the atom Helium (He) have?

• 2

• 3

• 4

• 1

How many electron shells (energy levels) does the atom Nitrogen (N) have?

• 2

• 3

• 4

• 1

How many electron shells (energy levels) does the atom Magnesium (Mg) have?

• 2

• 3

• 4

• 1

How does the mass of the proton compare to the mass of the electron in an atom?

• Proton Mass < Electron Mass

• Proton Mass > Electron Mass

• Proton Mass = Electron Mass

• The mass of the proton and electron are not related.