Question 1

Which quantum number primarily determines the energy level (shell) of an electron in an atom?

Accepted Answer

The principal quantum number, $$n$$

Question 2

What is the electron configuration of sodium ($$Z = 11) in $$its ground state?

Accepted Answer

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

Question 3

Which statement best describes Hund’s rule?

Accepted Answer

Electrons occupy degenerate orbitals singly with parallel spins before pairing

Question 4

A neutral atom of fluorine ($$Z = 9) $$has how many neutrons if its mass number is 19?

Accepted Answer

10

Question 5

Which of the following is NOT a consequence of the Pauli Exclusion Principle?

Accepted Answer

Electrons in different atoms can have the same quantum numbers

Question 6

Which element achieves a noble gas configuration by losing one electron from its valence shell?

Accepted Answer

Sodium

Question 7

What is the shape of a $$p$$ orbital?

Accepted Answer

Dumbbell-shaped

Question 8

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Question 9

Which rule explains why the electron configuration of neon is $$[2s^2$ 2p^6$]$$?

Accepted Answer

Octet rule

Question 10

In the context of ionic bonding, what happens when sodium reacts with chlorine?

Accepted Answer

Sodium donates an electron to chlorine, forming $$Na^+$$ and $$Cl^-$$ ions

Question 11

Which quantum number determines the spatial orientation of an orbital?

Accepted Answer

Magnetic quantum number, $$m_l$$

Question 12

What is the electron configuration for a carbon atom ($$Z = 6) in $$its ground state?

Accepted Answer

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

Question 13

Which of the following is a limitation of the octet rule?

Accepted Answer

It applies only to first row and roughly p block compounds

Question 14

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electron pairs between atoms

Question 15

What is the relative atomic mass ($$A_r) of an $$element?

Accepted Answer

The mass of an atom compared to one twelfth the mass of a carbon-12 atom

Question 16

Which of the following best describes the role of lone-pair electrons in organic chemistry?

Accepted Answer

They can act as nucleophiles and react with electrophiles

Question 17

A molecule of ammonia ($$NH_3) $$has how many lone pairs on the nitrogen atom?

Accepted Answer

1

Question 18

Which of the following is the correct order of filling orbitals according to the Aufbau principle?

Accepted Answer

$$1s \rightarrow 2s \rightarrow 2p \rightarrow 3s \rightarrow 3p \rightarrow 4s \rightarrow 3d$$

Question 19

Which of the following is a real-world application of understanding atomic structure and bonding?

Accepted Answer

Designing new drugs and materials

Question 20

Which of the following statements about the nucleus of an atom is correct?

Accepted Answer

The nucleus contains protons and neutrons

Atomic Structure and Bonding: Foundations for Organic Chemistry

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