Question 1

A photon of light has a wavelength of $$4.50 	imes 10$$^{-7}$$ m. What is the energy of this photon? (Planck's constant h = 6.626$$ 	imes $$10^{-34} J$$·s, speed of light $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$4.42 	imes 10$$^{-19}$$ J

Question 2

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

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

Question 3

Which of the following statements best describes the difference between a principal energy level, a sublevel, and an orbital?

Accepted Answer

A principal energy level contains one or more sublevels, each sublevel contains one or more orbitals, and each orbital can hold up to two electrons.

Question 4

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

Accepted Answer

Sulfur

Question 5

How many valence electrons are present in a neutral atom of magnesium?

Accepted Answer

2

Question 6

Which of the following elements is a transition metal?

Accepted Answer

Iron

Question 7

Which family name is given to the elements in Group 17 of the periodic table?

Accepted Answer

Halogens

Question 8

Which of the following best defines ionization energy?

Accepted Answer

The energy required to remove an electron from a gaseous atom in its ground state.

Question 9

Which of the following elements has the largest atomic radius?

Accepted Answer

Potassium

Question 10

Which of the following atoms is most electronegative?

Accepted Answer

Fluorine

Question 11

Which of the following ions is paramagnetic?

Accepted Answer

$$\mathrm{Fe}^{3+}$$

Question 12

Which of the following best describes the trend in ionization energy as you move across a period from left to right?

Accepted Answer

Ionization energy increases due to increasing nuclear charge.

Question 13

A hydrogen atom electron transitions from $$n=4 to$$ $$n=2. $$Which of the following statements is true?

Accepted Answer

A photon is emitted, and its energy equals the difference in energy between the two levels.

Question 14

Which of the following electron configurations represents a diamagnetic atom?

Accepted Answer

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

Question 15

Which of the following is the correct abbreviated electron configuration for calcium?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^2$

Question 16

Which of the following elements is a member of the noble gases?

Accepted Answer

Neon

Question 17

Which of the following best describes the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases due to the addition of energy levels.

Question 18

Which of the following elements is most likely to form a $$2+$$ ion?

Accepted Answer

Magnesium

Question 19

Which of the following is the correct order of increasing electronegativity among the elements: phosphorus, chlorine, sulfur, and fluorine?

Accepted Answer

Phosphorus \u003c Sulfur \u003c Chlorine \u003c Fluorine

Question 20

Which of the following best describes the electron configuration of a transition metal?

Accepted Answer

It has a partially filled d sublevel.

Quantum-Mechanical Model of the Atom & Periodic Properties of the Elements: Study Guide

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