Question 1

Which of the following best describes the color of light emitted when an electron in a hydrogen atom transitions from $$n=6 to$$ $$n=2$$?

Accepted Answer

Violet

Question 2

Given the hydrogen emission spectrum, what is the wavelength (in nm) of light emitted when an electron transitions from $$n=6 to$$ $$n=2$$? Use $$R_H = 1.097 	imes 10^7$ \ \mathrm{m}^{-1}.$$

Accepted Answer

$$\lambda = 410 \ \mathrm{nm}$$

Question 3

An unknown element is a nonmetal and has a valence electron configuration of $$ns^2np^4$. How many valence electrons does it have?

Accepted Answer

6

Question 4

Which of the following elements could have the valence electron configuration $$ns^2np^4$?

Accepted Answer

Sulfur

Question 5

What is the formula of the compound formed when an element with $$ns^2np^4$ configuration reacts with potassium?

Accepted Answer

$$K_2S$$

Question 6

Would an element with $$ns^2np^4$ configuration have a larger or smaller atomic radius than barium?

Accepted Answer

Smaller, because nonmetals are to the right and higher in the periodic table

Question 7

Would an element with $$ns^2np^4$ configuration have a greater or smaller ionization energy than fluorine?

Accepted Answer

Smaller, because it is to the left of fluorine in the periodic table

Question 8

Which quantum numbers are valid for a $$4p$$ electron?

Accepted Answer

$$n=4, \ l=1, \ m_l=0, \ m_s=+\frac{1}{2}$$

Question 9

Which set of quantum numbers is NOT allowed for any electron?

Accepted Answer

$$n=2, \ l=2, \ m_l=0, \ m_s=+\frac{1}{2}$$

Question 10

What is the maximum number of electrons that can occupy the $$4d$$ subshell?

Accepted Answer

10

Question 11

Which of the following is the correct ground state electron configuration for arsenic (As)?

Accepted Answer

$$[Ar] 4s^2$ 3d$$^{10}$$ 4p^3$

Question 12

Which element has three unpaired $$5d$$ electrons?

Accepted Answer

Os: $$[Xe] 4f$$^{14}$$ 5d^6$ 6s^2$

Question 13

Which halogen has electrons in the $$6p$$ atomic orbitals?

Accepted Answer

Astatine (At)

Question 14

Which of the following best explains why the ionization energy of oxygen is lower than that of fluorine?

Accepted Answer

Oxygen is to the left of fluorine in the periodic table, so it has a lower effective nuclear charge.

Question 15

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

Accepted Answer

$$n=6 to$$ $$n=2$$

Question 16

If the energy of a photon is $$4.85 	imes 10$$^{-19}$$ J, what is its wavelength? (h = 6.626$$ 	imes $$10^{-34} J$$·s, $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$\lambda = 410 \ \mathrm{nm}$$

Question 17

Which of the following is the correct order for filling electron subshells according to the Aufbau principle?

Accepted Answer

$$1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p$$

Question 18

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number $$m_l$$

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

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