$$E = 3.31 \times 10$$^{-20}$$ J

$$\lambda = 5.00 \times 10$$^{-7}$$ m

Question 1

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

Accepted Answer

Gamma ray

Question 2

If the frequency ($$
u) of a $$photon is $$5.0 	imes 10$$^{14}$$ Hz, what is the energy (E$) of the photon? Use h = 6.626$$ 	imes $$10^{-34} J$$·s.

Accepted Answer

$$E = 3.31 	imes 10$$^{-20}$$ J

Question 3

Which transition in the hydrogen atom would release the most energy as light?

Accepted Answer

From $$n = 10 to$$ $$n = 1$$

Question 4

Which of the following statements best explains why electrons in atoms occupy quantized energy levels?

Accepted Answer

The emission spectrum of hydrogen shows only specific wavelengths.

Question 5

What is the wavelength ($$\lambda) of $$light with a frequency ($$
u) of$$ $$6.0 	imes 10$$^{14}$$ Hz? Use c = 3.00$$ 	imes $$10^8 m/s.$$

Accepted Answer

$$\lambda = 5.00 	imes 10$$^{-7}$$ m

Question 6

Which orbital shape is correctly matched?

Accepted Answer

d orbital: four-leaf clover

Question 7

How many electrons can occupy the second shell ($$n=2) of an $$atom?

Accepted Answer

8

Question 8

Which of the following electron configurations represents an atom in an excited state?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^1$$\ $$3d^5$$

Question 9

Which rule states that electrons fill the lowest energy orbitals first?

Accepted Answer

Aufbau principle

Question 10

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

Accepted Answer

Neon (Ne)

Question 11

When forming a cation, from which orbital are electrons removed first?

Accepted Answer

The orbital with the highest principal quantum number ($$n)$$

Question 12

Which of the following ions is isoelectronic with Argon (Ar)?

Accepted Answer

Cl$$^-$$

Question 13

How many unpaired electrons are present in the ground state of a nitrogen atom?

Accepted Answer

3

Question 14

Which of the following best describes a photon?

Accepted Answer

A quantum of electromagnetic energy

Question 15

Which of the following transitions in the Bohr model is an example of excitation?

Accepted Answer

From $$n = 1 to$$ $$n = 3$$

Question 16

Which of the following subshells can hold a maximum of 6 electrons?

Accepted Answer

p

Question 17

Which of the following pairs of atoms/ions has the larger atomic radius?

Accepted Answer

Na and K; K is larger

Question 18

How many valence electrons does phosphorus (P) have?

Accepted Answer

5

Question 19

Which of the following best describes degenerate orbitals?

Accepted Answer

Orbitals with the same energy

Question 20

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

Accepted Answer

Pauli exclusion principle

Electrons in Atoms and the Periodic Table: Study Guide and Key Concepts

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