Question 1

Which statement best describes the relationship between principal energy levels, subshells, and orbitals in the quantum model of the atom?

Accepted Answer

Principal energy levels are divided into subshells, and each subshell contains one or more orbitals.

Question 2

How many electrons can occupy all the p orbitals in the second main shell?

Accepted Answer

6

Question 3

What is the ground state electron configuration for oxygen (atomic number 8)?

Accepted Answer

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

Question 4

Which element has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$?

Accepted Answer

Sodium

Question 5

How many valence electrons does chlorine have?

Accepted Answer

7

Question 6

Which of the following best explains why potassium (K) fills the 4s orbital before the 3d orbital?

Accepted Answer

The 4s orbital has a lower energy than the 3d orbital.

Question 7

A sample contains 10 g of $$Fe_2O_3 ($$rust). How many grams of iron (Fe) are present in the sample? (Atomic masses: Fe = 55.845, O = 15.999)

Accepted Answer

6.99 g

Question 8

Which of the following elements is a non-metal according to the periodic table?

Accepted Answer

Oxygen

Question 9

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

Accepted Answer

10

Question 10

Which group on the periodic table is characterized by having a full set of valence electrons?

Accepted Answer

Noble gases

Question 11

How many valence electrons does carbon have?

Accepted Answer

4

Question 12

Which of the following electron configurations represents a nitrogen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 13

Which analogy best describes the arrangement of electrons in an atom according to the quantum model?

Accepted Answer

A hotel, where each floor is a shell, each set of rooms is a subshell, and each room is an orbital.

Question 14

Which of the following is the correct electron configuration for chlorine (atomic number 17)?

Accepted Answer

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

Question 15

Which of the following statements about valence electrons is true?

Accepted Answer

Valence electrons determine the chemical bonding behavior of an element.

Question 16

If an atom has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^1$$, what element is it?

Accepted Answer

Boron

Question 17

Which of the following is NOT a correct statement about atomic orbitals?

Accepted Answer

The d subshell contains six orbitals.

Question 18

Which of the following best describes the difference between metals and non-metals on the periodic table?

Accepted Answer

Metals tend to lose electrons to form positive ions, while non-metals tend to gain electrons to form negative ions.

Question 19

Which of the following elements has a full p subshell in its ground state electron configuration?

Accepted Answer

Neon

Study Guide: Orbitals, Electron Configurations, and the Periodic Table

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