Question 1

Which of the following electron configurations violates Hund's Rule?

Accepted Answer

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

Question 2

According to the Aufbau Principle, which orbital is filled immediately after $$2p$$?

Accepted Answer

$$3s$$

Question 3

What is the ground state electron configuration for sulfur ($$Z = 16$$)?

Accepted Answer

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

Question 4

How many unpaired electrons are present in the ground state of oxygen ($$Z = 8$$)?

Accepted Answer

$$2$$

Question 5

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

Accepted Answer

Phosphorus

Question 6

If an atom has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^3$$, how many unpaired electrons does it have?

Accepted Answer

$$3$$

Question 7

Which of the following best describes a paired electron?

Accepted Answer

Two electrons occupying the same orbital with opposite spins

Question 8

Which of the following elements has the most unpaired electrons in its ground state?

Accepted Answer

Nitrogen ($$Z = 7)$$

Question 9

Which electron configuration represents a violation of the Aufbau Principle?

Accepted Answer

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

Question 10

Which of the following is the correct electron configuration for magnesium ($$Z = 12$$)?

Accepted Answer

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

Question 11

Which rule states that electrons fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund's Rule

Question 12

What is the maximum number of electrons that can occupy a $$p$$ orbital?

Accepted Answer

$$2$$

Question 13

Which of the following elements has a completely filled $$2p$$ subshell?

Accepted Answer

Neon ($$Z = 10)$$

Question 14

If an atom has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^5$$, how many unpaired electrons does it have?

Accepted Answer

$$1$$

Question 15

Which of the following is a correct application of the Pauli Exclusion Principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers

Question 16

Which element has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^5$$?

Accepted Answer

Chlorine

Question 17

How many electrons are present in the $$3p$$ subshell of silicon ($$Z = 14$$)?

Accepted Answer

$$2$$

Question 18

Which of the following electron configurations is NOT possible for a neutral atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^7$$

Question 19

Which of the following elements has only one unpaired electron in its ground state?

Accepted Answer

Fluorine ($$Z = 9)$$

Question 20

Which of the following statements about electron configuration is correct?

Accepted Answer

Electrons fill orbitals in order of increasing energy, following the Aufbau Principle

Electron Configuration and Orbital Diagrams: Study Notes

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