Question 1

The maximum energy required to cause the photoelectric effect in potassium metal is 3.68 × $$10^{-19} J. $$What is the threshold frequency ($$
u_0$) for potassium? (Use E = h$$
u$$ and h = 6.626$$ 	imes $$10^{-34} J$$·s)

Accepted Answer

$$5.55 	imes 10$$^{14}$$ Hz

Question 2

A photon with energy $$4.00 	imes 10$$^{-19}$$ J strikes a potassium surface. If the work function is 3.68$$ 	imes $$10^{-19} J$$, what is the velocity of the emitted electron? (Use $$E_{kinetic} = E_{photon} - \phi$$ and $$E_{kinetic} = \frac{1}{2}mv^2$, m = 9.11$$ 	imes $$10^{-31} kg)$$

Accepted Answer

$$1.31 	imes 10$$^{5}$$ m/s

Question 3

The Lyman series of the hydrogen spectrum can be represented by the equation $$\frac{1}{\lambda} = 1.097 	imes 10$$^{7}$$ \left(1 - \frac{1}{n^2$}ight)$$, where $$n = 2, 3, .... $$What is the wavelength of the transition from $$n = 3 to$$ $$n = 1$$?

Accepted Answer

$$1.026 	imes 10$$^{-7}$$ m

Question 4

Which of the following statements about the photoelectric effect is correct?

Accepted Answer

Electrons are emitted only if the frequency of incident light exceeds a threshold value.

Question 5

A hydrogen atom undergoes a transition from $$n=4 to$$ $$n=2. $$What is the energy of the emitted photon? (Use $$E_n = -2.18 	imes 10$$^{-18}$$ \frac{1}{n^2$} J)$$

Accepted Answer

$$4.09 	imes 10$$^{-19}$$ J

Question 6

Which electron configuration corresponds to the ground state of molybdenum (Mo)?

Accepted Answer

[Kr] $$5s^1$$ $$4d^5$$

Question 7

Which element has the electron configuration $$[Xe] 4f$$^{14}$$ 5d$$^{10}$$ 6s^2$ 6p^2$?

Accepted Answer

Lead (Pb)

Question 8

Which of the following electron configurations is NOT possible for a neutral atom?

Accepted Answer

[Ar] $$3d^7$$ $$4s^2$$ $$4p^6$$

Question 9

An electron in a box has a wavelength of $$2.0 	imes 10$$^{-9}$$ m. If the box is 1.0$$ 	imes $$10^{-9} m $$wide, which quantum number ($$n) $$does the electron occupy?

Accepted Answer

n = 2

Question 10

Which of the following is a correct statement about the relationship between energy and wavelength for electromagnetic radiation?

Accepted Answer

Energy is inversely proportional to wavelength: $$E = \frac{hc}{\lambda}$$

Question 11

Which of the following elements has the electron configuration $$[Ne] 3s^2$ 3p^5$?

Accepted Answer

Chlorine (Cl)

Question 12

Which quantum number determines the shape of an orbital?

Accepted Answer

Azimuthal quantum number ($$l)$$

Question 13

Which of the following transitions in the hydrogen atom emits the highest energy photon?

Accepted Answer

n = 2 to n = 1

Question 14

Which of the following is the correct ground-state electron configuration for silver (Ag)?

Accepted Answer

[Kr] $$5s^1$$ $$4d^{10}$$

Question 15

Which of the following best explains why the $$4s$$ orbital is filled before the $$3d$$ orbital in the ground state of transition metals?

Accepted Answer

The $$4s$$ orbital is lower in energy than the $$3d$$ orbital.

Question 16

Which of the following elements has the electron configuration $$[Kr] 4d$$^{10}$$ 5s^2$ 5p^5$?

Accepted Answer

Iodine (I)

Question 17

Which rule states that electrons fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund's rule

Question 18

Which of the following electron configurations represents a noble gas?

Accepted Answer

[Xe] $$4f^{14}$$ $$5d^{10}$$ $$6s^2$$ $$6p^6$$

Question 19

Which of the following is the correct electron configuration for the ground state of copper (Cu)?

Accepted Answer

[Ar] $$4s^1$$ $$3d^{10}$$

Atomic Structure, Electron Configurations, and the Hydrogen Spectrum

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