Q: A photon of wavelength $$0.287\ \text{nm}$$ strikes a metal surface and an electron is emitted with a kinetic energy of $$715\ \text{eV}. $$What is the binding energy of the electron in $$\text{kJ/mol}$$? (Use $$1\ \text{eV} = 1.602 \times 10$$^{-19}$$\ \text{J}$$ and $$N_A = 6.022 \times 10$$^{23}$$\ \text{mol}^{-1})$$

$$2.48 \times 10^5$\ \text{kJ/mol}$$

Q: Which equation correctly relates the energy, frequency, and wavelength of electromagnetic radiation?

Both $$E = h\nu$$ and $$E = \dfrac{hc}{\lambda}$$

Question 1

Which of the following statements best describes the dual nature of light?

Accepted Answer

Light exhibits both wave-like and particle-like properties depending on the experiment.

Question 2

A photon of wavelength $$0.287\ 	ext{nm}$$ strikes a metal surface and an electron is emitted with a kinetic energy of $$715\ 	ext{eV}. $$What is the binding energy of the electron in $$	ext{kJ/mol}$$? (Use $$1\ 	ext{eV} = 1.602 	imes 10$$^{-19}$$\ 	ext{J}$$ and $$N_A = 6.022 	imes 10$$^{23}$$\ 	ext{mol}^{-1})$$

Accepted Answer

$$2.48 	imes 10^5$\ 	ext{kJ/mol}$$

Question 3

Which equation correctly relates the energy, frequency, and wavelength of electromagnetic radiation?

Accepted Answer

Both $$E = h
u$$ and $$E = \dfrac{hc}{\lambda}$$

Question 4

What is the wavelength (in nm) of light emitted when an electron in a hydrogen atom transitions from $$n=5 to$$ $$n=3$$? (Use $$R_H = 1.097 	imes 10^7$\ 	ext{m}^{-1})$$

Accepted Answer

$$1280\ 	ext{nm}$$

Question 5

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number ($$l)$$

Question 6

Which of the following ions is isoelectronic with $$	ext{Mg}^{2+}$$?

Accepted Answer

$$	ext{O}^{2-}$$

Question 7

Based on the periodic properties table, which ion has the largest ionic radius?

Accepted Answer

$$	ext{S}^{2-}$$

Question 8

Which process is exothermic?

Accepted Answer

Formation of an ionic bond from gaseous ions

Question 9

What is the main limitation of the Bohr model of the atom?

Accepted Answer

It cannot explain the spectra of multi-electron atoms.

Question 10

Which of the following best describes a paramagnetic atom?

Accepted Answer

It has one or more unpaired electrons.

Question 11

Which of the following best explains the trend in atomic radius across a period?

Accepted Answer

Atomic radius decreases due to increased nuclear charge pulling electrons closer.

Question 12

Which element has the highest second ionization energy based on the bar graph provided?

Accepted Answer

Lithium

Question 13

Which electron is easiest to remove according to the Bohr model diagram provided?

Accepted Answer

Electron $$\gamma$$

Question 14

Which of the following best describes the concept of binding energy in photoelectron spectroscopy (PES)?

Accepted Answer

The energy required to remove an electron from an atom.

Question 15

The electron affinity of thulium is measured using photons of $$1064\ 	ext{nm}$$ and the ejected electrons have $$0.137\ 	ext{eV}$$ energy. What is the electron affinity in $$	ext{eV}$$ per atom? ($$E = \dfrac{hc}{\lambda}$$, $$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s}$$, $$c = 3.00 	imes 10^8$\ 	ext{m/s}$$, $$1\ 	ext{eV} = 1.602 	imes 10$$^{-19}$$\ 	ext{J})$$

Accepted Answer

$$1.03\ 	ext{eV}$$

Question 16

Which of the following electron configurations represents a diamagnetic ion?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 17

Which of the following best explains why the third ionization energy of magnesium is much higher than the second?

Accepted Answer

The third electron is removed from a new, more stable shell closer to the nucleus.

Question 18

Which of the following best describes the effect of crystalline lattice energy on the formation of ionic compounds?

Accepted Answer

Lattice energy increases the stability of the ionic compound.

Question 19

Which of the following is the correct order of increasing energy for electromagnetic radiation?

Accepted Answer

Radio \u003c Infrared \u003c Visible \u003c Ultraviolet \u003c X-ray \u003c Gamma ray

Atomic Structure, Electron Configuration, and Periodic Trends: Study Notes

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