Question

2.3 bohr models directions: identify the bohr models.

Explanation:

Step1: Recall element - electron relationship

The number of protons (positive charge in the nucleus) determines the element. The number of electrons is equal to the number of protons in a neutral atom.

Step2: Identify first model

For the model with + 14 in the nucleus, the atomic number is 14. The element with atomic number 14 is silicon (Si).

Step3: Identify second model

For the model with + 9 in the nucleus, the atomic number is 9. The element with atomic number 9 is fluorine (F).

Step4: Identify third model

For the model with + 20 in the nucleus, the atomic number is 20. The element with atomic number 20 is calcium (Ca).

Step5: Identify fourth model

For the model with + 5 in the nucleus, the atomic number is 5. The element with atomic number 5 is boron (B).

Answer:

Top - left: Silicon (Si); Top - right: Fluorine (F); Bottom - left: Calcium (Ca); Bottom - right: Boron (B)