Final answer:
The model described in the question represents Lithium, as it has the same number of protons, neutrons, and electrons as the Lithium atom described in the provided reference materials.
Step-by-step explanation:
The model of the unknown atom presented in the question has three protons and four neutrons in the nucleus, with three electrons moving around the nucleus. To identify this element, we can refer to its atomic number, which is equal to the number of protons in an atom.
According to the periodic table, the element with three protons is Lithium (Li), which falls under Group 1A of the table. Lithium has two electrons in its first energy level and one electron in the second energy level. This matches the model described in the question, which means the correct answer is Lithium.