Q: A photon has a wavelength of $$500\ \mathrm{nm}. $$What is its energy? (Use $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 \times 10^8$\ \mathrm{m/s}$$, and $$1\ \mathrm{nm} = 1 \times 10$$^{-9}$$\ \mathrm{m})$$

$$E = 3.98 \times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which type of atomic orbital is depicted in the image above?

Accepted Answer

An s orbital

Question 2

Which equation correctly relates the speed ($$c$$), wavelength ($$\lambda$$), and frequency ($$
u) of $$light?

Accepted Answer

$$c = \lambda 
u$$

Question 3

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 4

Which of the following best describes the Bohr model's explanation for the emission spectrum of hydrogen?

Accepted Answer

Electrons occupy fixed energy levels and emit photons when transitioning between these levels.

Question 5

Which element has the electron configuration $$[\mathrm{Ne}]\ 3s^2$\ 3p^4$?

Accepted Answer

Sulfur (S)

Question 6

Which of the following trends is correct as you move from left to right across a period in the periodic table?

Accepted Answer

Electronegativity increases

Question 7

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

CO$$_2$$

Question 8

What is the correct Lewis structure for the nitrate ion, NO$$_3^-$$, considering resonance?

Accepted Answer

Three equivalent structures with one double bond and two single bonds, with the negative charge delocalized.

Question 9

Which of the following best describes the shape of a molecule with four electron groups and two lone pairs around the central atom?

Accepted Answer

Bent

Question 10

A photon has a wavelength of $$500\ \mathrm{nm}. $$What is its energy? (Use $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 	imes 10^8$\ \mathrm{m/s}$$, and $$1\ \mathrm{nm} = 1 	imes 10$$^{-9}$$\ \mathrm{m})$$

Accepted Answer

$$E = 3.98 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 11

Which of the following ions has the same electron configuration as neon ($$[\mathrm{Ne}]$$)?

Accepted Answer

Na$$^+$$

Question 12

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

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 13

Which of the following elements has the highest first ionization energy?

Accepted Answer

Fluorine (F)

Question 14

Which of the following best explains why metals tend to lose electrons to form cations?

Accepted Answer

They have low ionization energies.

Question 15

Which of the following molecules has a trigonal pyramidal shape?

Accepted Answer

NH$$_3$$

Question 16

Which of the following statements about electron affinity is correct?

Accepted Answer

Electron affinity generally increases across a period from left to right.

Question 17

Which of the following is the correct noble gas core electron configuration for Fe$$^{2+}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^6$

Question 18

Which of the following best describes the relationship between wavelength and energy for electromagnetic radiation?

Accepted Answer

As wavelength increases, energy decreases.

Question 19

Which of the following is a correct Lewis structure for water (H$$_2O$$)?

Accepted Answer

Oxygen atom with two single bonds to hydrogen and two lone pairs on oxygen.

Question 20

Which of the following best explains why CO$$_2 is $$nonpolar?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other.

Study Notes: Electrons in Atoms and the Periodic Table, Chemical Bonding, and Molecular Structure

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