Question 1

Which neutral atom in its ground state is represented by the following electron configuration: $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{10}$$\ $$4p^2$$?

Accepted Answer

Ge

Question 2

Which of the following sets of quantum numbers does NOT represent an electron in its ground state?

Accepted Answer

$$n=1,\ l=1,\ m_l=-1,\ m_s=+1/2$$

Question 3

A solar cell is exposed to light with a maximum irradiance at $$476.6\ \mathrm{nm}. $$What is the maximum band gap (in eV) that could be overcome by this wavelength? ($$h=6.626\$$times10^{-34}$$\ \mathrm{J\cdot s}$$, $$c=3.00\$$times10^8$$\ \mathrm{m/s}$$, $$1\ \mathrm{eV}=1.6022\$$times10^{-19}$$\ \mathrm{J})$$

Accepted Answer

$$2.60\ \mathrm{eV}$$

Question 4

If you dope tellurium (Te, $$Z=52) $$with antimony (Sb, $$Z=51$$), what type of material do you create?

Accepted Answer

n-type semiconductor

Question 5

Which of the following statements is TRUE?

Accepted Answer

An electron in the conduction band has a higher energy than an electron in the valence band.

Question 6

In a solar cell with n-type and p-type layers, photoelectrons flow toward which layer to generate current?

Accepted Answer

p-type layer

Question 7

Which of the following elements would have the largest band gap?

Accepted Answer

Bromine (Br, $$Z=35)$$

Question 8

How many orientations of d orbitals exist?

Accepted Answer

5

Question 9

Which of the following images represents a d orbital?

Accepted Answer

Image 1 (four-lobed shape in the xy-plane)

Question 10

What is the condensed electron configuration for lead (Pb, $$Z=82$$)?

Accepted Answer

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

Question 11

A lead apron has a surface area of $$0.4125\ \mathrm{m}^2$$ and a thickness of $$0.65\ \mathrm{mm}. If $$the density of Pb is $$11.3\ \mathrm{g/cm}^3$$, how many atoms of Pb does the apron contain? ($$M_{Pb}=207.2\ \mathrm{g/mol}$$, $$N_A=6.022\$$times10^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

$$1.47\$$times10^{25}$$ atoms

Question 12

A metal has a binding energy of $$408\ \mathrm{kJ/mol}. If UV $$photons eject electrons with a kinetic energy of $$5.35\$$times10^{-19}$$\ \mathrm{J}$$, what is the frequency of the UV photons? ($$N_A=6.022\$$times10^{23}$$\ \mathrm{mol}^{-1}$$, $$h=6.626\$$times10^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$1.13\$$times10^{15}$$\ \mathrm{s}^{-1}$$

Question 13

Increasing the ________ of the light source will increase the number of electrons ejected in the photoelectric effect.

Accepted Answer

Amplitude

Question 14

Increasing the ________ of the light source will increase the kinetic energy of each ejected electron in the photoelectric effect.

Accepted Answer

Frequency

Question 15

Which of the following changes would result in an isotope of phosphorus-32 (P-32)?

Accepted Answer

Number of neutrons

Question 16

What is the effective nuclear charge ($$Z_{eff}) $$for a neutral calcium atom ($$Z=20$$)?

Accepted Answer

2

Question 17

Which element has the more positive ionization energy?

Accepted Answer

Br

Question 18

Which element has greater metallic character?

Accepted Answer

Ca

Question 19

If calcium and bromine become ions, what are their most likely resulting charged species?

Accepted Answer

$$Ca^{2+}$$ and $$Br^-$$

CHEM135 Exam 1 Study Guidance – Atomic Structure, Quantum Numbers, Solar Cells, and More

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