Question

10,162 Learners found this answer helpful

leaming target i can determine the number of valence electrons for elements in groups 1 - 8 on the periodic table 2a a student drew the following bohr model for a neutral oxygen (o) atom with a mass of 16. identify 2 mistakes the student made and how you could correct them (2 points)

Explanation:

Step1: Analyze electron - shell capacity

The first electron - shell can hold a maximum of 2 electrons, and the second can hold a maximum of 8 electrons. In the given Bohr model of oxygen, the electron distribution is incorrect. Oxygen has 8 electrons. The first shell should have 2 electrons and the second shell should have 6 electrons, not the way it is distributed in the model.

Step2: Consider electron - pair arrangement

In the Bohr model, electrons in the outer shell should be placed singly first before pairing up (Hund's rule in a simplified Bohr - model context). In the given model, the electron - pair arrangement in the outer shell is not following this principle.

Answer:

Mistake 1: Incorrect electron - shell distribution. Oxygen has 8 electrons. The first shell should have 2 electrons and the second shell should have 6 electrons instead of the distribution shown. Correction: Move electrons to have 2 in the first shell and 6 in the second shell.
Mistake 2: Incorrect electron - pair arrangement in the outer shell. Electrons in the outer shell should be placed singly first before pairing up. Correction: Rearrange the electrons in the outer shell according to the correct electron - placement principle.