Question

multiple choice 1 point
which statement is true regarding the quantum mechanical nature of light and of matter?
○ dual nature refers to mass and volume; all matter must have both a mass and a volume.
○ the quantum mechanical model works because both photons and electrons have a dual nature.
○ the quantum mechanical model of the atom is based on the periodic table.
○ the quantum mechanical model verifies that the plum pudding model is accurate.
30 multiple choice 1 point
fluorine is the most electronegative element meaning that it..
○ is the smallest element.
○ has the largest negative charge.
○ is less likely to form a polar bond.
○ has the greatest tendency to pull electron density toward itself when bonding.

Explanation:

Question 29 (Quantum Mechanics of Light and Matter)

• Option 1: Dual nature in quantum mechanics is wave - particle duality, not mass - volume. Eliminate.
• Option 2: Photons (light) and electrons (matter) exhibit wave - particle duality. The quantum mechanical model relies on this dual nature. This is correct.
• Option 3: The quantum mechanical model of the atom is based on wave - particle duality and quantum theory, not the periodic table. Eliminate.
• Option 4: The quantum mechanical model disproves the plum pudding model (which was incorrect about atomic structure). Eliminate.

• Option 1: Electronegativity is not about the size of the element. Eliminate.
• Option 2: Electronegativity is not about the charge of the element. Eliminate.
• Option 3: A highly electronegative element like fluorine is more likely to form polar bonds (as it pulls electrons). Eliminate.
• Option 4: Electronegativity is the tendency to attract electron density in a bond. Fluorine, being the most electronegative, has the greatest tendency to pull electron density toward itself when bonding. This is correct.

Answer:

B. The quantum mechanical model works because both photons and electrons have a dual nature.

Question 30 (Electronegativity of Fluorine)