Question

lucas created the model below to represent a neutral lithium (li) atom with a mass number of 7. there is an error in lucass model. use the drop - down menus below to identify how lucas should change the model so that it correctly represents the atom. lucas should from the model.

Explanation:

Step1: Determine the number of protons in a lithium atom

Lithium has an atomic number of 3. In a neutral atom, the number of protons = number of electrons. So, a neutral Li atom has 3 electrons.

Step2: Count the number of electrons in Lucas's model

In the model, there are 4 electrons (the light - purple circles).

Answer:

Lucas should remove 1 electron from the model.