Question

what element is shown in the model: (protons = red, neutrons = yellow, electrons = blue)
phosphorus
boron
neon
isotopes are different forms of an element that have the same number of
and different numbers of
electrons, protons
protons, neutrons
neutrons, protons

Explanation:

• For the first question:
• The atomic number (number of protons) determines the element. Counting the red spheres (protons) in the model, there are 5. Boron has an atomic number of 5. Phosphorus has an atomic number of 15 and neon has an atomic number of 10.
• For the second question:
• By definition, isotopes of an element have the same number of protons (which defines the element) and different numbers of neutrons.

Answer:

• First question: boron
• Second question: protons, neutrons