Question 1

Which quantum number determines the overall energy level of an electron in an atom?

Accepted Answer

The principal quantum number, $$n$$

Question 2

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

Accepted Answer

Two

Question 3

Which of the following sets 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 4

Which orbital type is spherical in shape?

Accepted Answer

s orbital

Question 5

How many possible values of $$m_l$$ are there for a $$d$$ orbital?

Accepted Answer

Five

Question 6

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

Accepted Answer

Pauli Exclusion Principle

Question 7

What is the electron configuration for the fluoride ion ($$F^-$$)?

Accepted Answer

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

Question 8

Which element has the electron configuration $$[Ar] 4s^2$ 3d^6$?

Accepted Answer

Iron ($$Fe)$$

Question 9

Why does the atomic radius generally decrease from left to right across a period?

Accepted Answer

Increasing nuclear charge pulls electrons closer to the nucleus

Question 10

Which of the following ions is largest in an isoelectronic series: $$Na^+$$, $$Mg^{2+}$$, $$Al^{3+}$$?

Accepted Answer

$$Na^+$$

Question 11

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

Accepted Answer

Fluorine ($$F)$$

Question 12

What is the condensed electron configuration for potassium ($$K$$), atomic number 19?

Accepted Answer

$$[Ar] 4s^1$

Question 13

Which rule explains why electrons fill degenerate orbitals singly before pairing?

Accepted Answer

Hund's Rule

Question 14

Which of the following statements about transition metals is correct?

Accepted Answer

They fill the $$d$$ orbitals after the $$s$$ orbital of the next higher energy level is filled

Question 15

Which element is predicted to have electrons entering the $$4f$$ sublevel?

Accepted Answer

Cerium ($$Ce)$$

Question 16

What is the electron configuration for $$Fe^{2+}$$?

Accepted Answer

$$[Ar] 3d^6$

Question 17

Which of the following best describes the trend in electron affinity across a period?

Accepted Answer

It generally increases (becomes more negative) from left to right

Question 18

Which of the following elements is most likely to form a cation?

Accepted Answer

Sodium ($$Na)$$

Question 19

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number, $$m_l$$

Question 20

Which of the following electron configurations represents a ground state atom?

Accepted Answer

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

Electronic Structure of Atoms: Quantum Numbers, Orbitals, and Electron Configurations

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