DAT General Chemistry: Atomic Structure and Periodic Trends 2

Question 1

What is the correct ground-state electron configuration of copper (Z = 29)?

Accepted Answer

[Ar]3d¹⁰4s¹

Answer

Copper is an exception to the Aufbau principle; it adopts [Ar]3d¹⁰4s¹ because a fully filled 3d subshell provides extra stability.

Question 2

Which equation correctly gives the energy of a photon?

Accepted Answer

E = hν

Answer

Planck's equation E = hν states that photon energy equals Planck's constant (h) multiplied by the photon's frequency (ν).

Question 3

The de Broglie hypothesis proposes that:

Accepted Answer

All matter exhibits wave-like properties with wavelength λ = h/mv

Answer

de Broglie proposed that all matter has an associated wavelength λ = h/mv, extending wave-particle duality beyond photons to all particles.

Question 4

Hund's rule states that electrons in degenerate orbitals will:

Accepted Answer

Occupy separate orbitals with parallel spins before any pairing

Answer

Hund's rule states that electrons fill degenerate orbitals singly with parallel spins before any orbital receives a second electron.

Question 5

Which property generally INCREASES as you move down a group in the periodic table?

Accepted Answer

Atomic radius

Answer

Atomic radius increases down a group because each successive element gains an additional electron shell, increasing the distance between the nucleus and valence electrons.

DAT Practice Test

DAT Practice Test

DAT General Chemistry: Atomic Structure and Periodic Trends 2