Q: A photon of light has a wavelength of $$\lambda = 500 \ \text{nm}. $$What is its frequency? (Speed of light $$c = 3.00 \times 10^8$ \ \text{m/s})$$

$$6.00 \times 10$$^{14}$$ \ \text{Hz}$$

Q: Calculate the energy change ($$\Delta E) $$for a photon with wavelength $$\lambda = 400 \ \text{nm}$$ using $$\Delta E = \frac{hc}{\lambda}$$, where $$h = 6.63 \times 10$$^{-34}$$ \ \text{J s}$$ and $$c = 3.00 \times 10^8$ \ \text{m/s}.$$

$$4.97 \times 10$$^{-19}$$ \ \text{J}$$

Question 1

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli exclusion principle

Question 2

What is the maximum number of electrons that can occupy the third energy level (n=3) in an atom?

Accepted Answer

18

Question 3

A photon of light has a wavelength of $$\lambda = 500 \ 	ext{nm}. $$What is its frequency? (Speed of light $$c = 3.00 	imes 10^8$ \ 	ext{m/s})$$

Accepted Answer

$$6.00 	imes 10$$^{14}$$ \ 	ext{Hz}$$

Question 4

Which of the following types of electromagnetic radiation has the highest energy?

Accepted Answer

Gamma rays

Question 5

According to the Aufbau principle, which orbital is filled first?

Accepted Answer

1s

Question 6

Which element has the highest ionization energy among the following?

Accepted Answer

Neon (Ne)

Question 7

What is the electron configuration for oxygen ($$Z=8$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 8

How many valence electrons does carbon have?

Accepted Answer

4

Question 9

Calculate the energy change ($$\Delta E) $$for a photon with wavelength $$\lambda = 400 \ 	ext{nm}$$ using $$\Delta E = \frac{hc}{\lambda}$$, where $$h = 6.63 	imes 10$$^{-34}$$ \ 	ext{J s}$$ and $$c = 3.00 	imes 10^8$ \ 	ext{m/s}.$$

Accepted Answer

$$4.97 	imes 10$$^{-19}$$ \ 	ext{J}$$

Question 10

Which periodic trend increases as you move from left to right across a period?

Accepted Answer

Ionization energy

Question 11

Which molecule violates the octet rule?

Accepted Answer

BF$$_3$$

Question 12

Which of the following molecules has resonance structures?

Accepted Answer

O$$_3$$

Question 13

What is the shape and bond angle of a molecule with a steric number (SN) of 4 and no lone pairs?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 14

Which bond is classified as polar covalent?

Accepted Answer

O-H

Question 15

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

CO$$_2$$

Question 16

Draw the Lewis dot structure for water (H$$_2O). $$How many lone pairs are on the central atom?

Accepted Answer

2

Question 17

Which statement best explains why atomic size decreases across a period?

Accepted Answer

The nuclear charge increases, pulling electrons closer

Question 18

Which of the following is an example of an excited state electron configuration for sodium ($$Z=11$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3p^1$$

Question 19

Which vector direction correctly represents the polarity of the O-H bond in water?

Accepted Answer

From H to O

Electrons in Atoms, the Periodic Table, and Chemical Bonding: Study Guide

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