Question 1

Which of the following orbital diagrams represents a possible electron configuration for a neutral sodium (Na) atom?

Accepted Answer

The first diagram

Question 2

Which orbital diagram violates Hund's rule?

Accepted Answer

The second diagram

Question 3

Which element is represented by the orbital diagram with the configuration $$[\mathrm{He}]\ 2s^2$\ 2p^3$?

Accepted Answer

Nitrogen

Question 4

The orbital diagram $$[\mathrm{Ar}]\ 4s^1$\ 3d^5$ represents which element?

Accepted Answer

Chromium

Question 5

Which of the following orbital diagrams is not possible due to the Pauli exclusion principle?

Accepted Answer

An orbital with three arrows in the same box

Question 6

What is the total number of electrons represented in the orbital diagram $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$?

Accepted Answer

$$11$$

Question 7

Which quantum mechanical principle explains why the $$2p$$ orbitals in the third diagram are each singly occupied before any pairing occurs?

Accepted Answer

Hund's Rule

Question 8

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

Accepted Answer

$$12$$

Question 9

Which of the following orbital diagrams represents an excited state of an atom?

Accepted Answer

A diagram where an electron is promoted to a higher energy orbital before lower energy orbitals are fully filled

Question 10

Which element has the ground state electron configuration $$[\mathrm{He}]\ 2s^2$\ 2p^6$?

Accepted Answer

Neon

Question 11

How many unpaired electrons are present in the orbital diagram $$[\mathrm{He}]\ 2s^2$\ 2p^3$?

Accepted Answer

$$3$$

Question 12

Which of the following best describes the electron configuration for a potassium ion, $$\mathrm{K}^+$$?

Accepted Answer

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

Question 13

Which of the following orbital diagrams represents the element with atomic number 8?

Accepted Answer

A diagram with $$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 14

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

Accepted Answer

Aufbau Principle

Question 15

What is the maximum number of electrons that can occupy the $$3d$$ subshell?

Accepted Answer

$$10$$

Analyzing Orbital Box Diagrams: Possibility and Element Identification

Study Guide - Practice Questions