Chemistry Test Atomic Structure 3

Question 1

The photoelectric effect provided evidence that light behaves as:

Accepted Answer

A stream of particles called photons

Answer

A continuous wave

Answer

A magnetic field

Answer

A standing wave

Question 2

Which element has the electron configuration [Ne] 3s² 3p⁶ 3d⁵ 4s²?

Accepted Answer

Manganese (Mn)

Answer

Iron (Fe)

Answer

Chromium (Cr)

Answer

Zinc (Zn)

Question 3

According to Heisenberg's Uncertainty Principle, it is impossible to simultaneously know precisely the electron's:

Accepted Answer

Position and momentum

Answer

Charge and mass

Answer

Spin and charge

Answer

Mass and energy

Question 4

Which of the following ions is isoelectronic with the noble gas neon (Ne)?

Accepted Answer

Na⁺

Answer

K⁺

Answer

Ca²⁺

Answer

Mg²⁺

Question 5

Which property of electrons was demonstrated by the Davisson-Germer experiment?

Accepted Answer

Wave-particle duality

Answer

Negative charge

Answer

Constant spin

Answer

Orbital quantization

Question 6

In the ground state, which orbital does the 25th electron of manganese occupy according to Hund's rule?

Accepted Answer

3d with unpaired spin (fifth 3d electron)

Answer

3d with paired spin

Answer

4s with paired spin

Answer

4p

Question 7

The de Broglie wavelength of a particle is inversely proportional to its:

Accepted Answer

Momentum

Answer

Temperature

Answer

Charge

Answer

Volume