Question 1

Which statement best describes the energy of orbitals in a hydrogen atom compared to a multi-electron atom?

Accepted Answer

In hydrogen, all orbitals with the same principal quantum number $$n$$ are degenerate, but in multi-electron atoms, only orbitals within the same sublevel are degenerate.

Question 2

What is the maximum number of electrons that can occupy the $$n=3$$ shell in an atom?

Accepted Answer

$$18$$

Question 3

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

Accepted Answer

$$n=3,\ l=0,\ m_l=1,\ m_s=-\frac{1}{2}$$

Question 4

How many orbitals are present in the $$l=3$$ subshell?

Accepted Answer

$$7$$

Question 5

According to Hund’s Rule, what is the most stable arrangement of electrons in a set of degenerate orbitals?

Accepted Answer

Electrons fill each orbital singly with parallel spins before pairing.

Question 6

Which element has the abbreviated electron configuration $$[Ne]3s^1$?

Accepted Answer

Sodium

Question 7

What is the electron configuration for the chloride ion ($$Cl^-$$)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^6$$

Question 8

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

Accepted Answer

Pauli Exclusion Principle

Question 9

For the element manganese ($$Mn$$), what is the correct abbreviated electron configuration?

Accepted Answer

$$[Ar]4s^23$d^5$

Question 10

Which block of the periodic table corresponds to the filling of $$d$$ orbitals?

Accepted Answer

Transition metals

Question 11

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

Accepted Answer

$$10$$

Question 12

Which element has the electron configuration $$1s^22s^22$p^63s^23$p^2$$?

Accepted Answer

Silicon

Question 13

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

Accepted Answer

Magnetic quantum number $$m_l$$

Question 14

What is the electron configuration for a $$Sr^{2+}$$ ion?

Accepted Answer

$$1s^22s^22$p^63s^23$p^64s^23$d^{10}4p^6$

Question 15

Which of the following is true about the electron configuration of carbon-12 and carbon-14?

Accepted Answer

They have the same electron configuration because they are isotopes of the same element.

Question 16

Which quantum number is responsible for the magnetic field associated with an electron’s spin?

Accepted Answer

Spin quantum number $$m_s$$

Question 17

What is the order of filling for the following orbitals: $$3d$$, $$4s$$, $$4p$$?

Accepted Answer

$$4s \u003c 3d \u003c 4p$$

Question 18

How many subshells are present in the $$n=3$$ shell?

Accepted Answer

$$3$$

Question 19

Which element has the abbreviated electron configuration $$[Ar]4s^1$?

Accepted Answer

Potassium

Quantum Numbers, Atomic Orbitals, and Electron Configurations

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