Question 1

Which statement best describes the periodic law as established by Mendeleev?

Accepted Answer

Elements are arranged by increasing atomic number, resulting in periodic repetition of chemical properties.

Question 2

What is the maximum number of electrons that can occupy a single orbital, according to the Pauli exclusion principle?

Accepted Answer

$$2$$

Question 3

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number $$l$$

Question 4

An atom has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^5. $$Which element is this?

Accepted Answer

Chlorine $$(Cl)$$

Question 5

Which of the following ions is paramagnetic?

Accepted Answer

$$Fe^{3+}$$

Question 6

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

Accepted Answer

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

Question 7

Which element has the highest first ionization energy?

Accepted Answer

Neon $$(Ne)$$

Question 8

What is the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases due to addition of electron shells.

Question 9

Which statement best explains why $$Na^+ is $$smaller than $$Na$$?

Accepted Answer

$$Na^+$$ has fewer electrons, resulting in less electron-electron repulsion.

Question 10

Which of the following best describes the concept of effective nuclear charge ($$Z_{eff}$$)?

Accepted Answer

The net positive charge experienced by an electron after accounting for shielding by other electrons.

Question 11

Which of the following elements is most likely to form a $$2^+$$ cation with a noble gas configuration?

Accepted Answer

Magnesium $$(Mg)$$

Question 12

Which of the following statements about electron affinity is correct?

Accepted Answer

Electron affinity generally becomes more exothermic across a period.

Question 13

Which of the following elements is most metallic?

Accepted Answer

Cesium $$(Cs)$$

Question 14

Which electron configuration represents a diamagnetic atom?

Accepted Answer

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

Question 15

Which of the following best explains the trend in ionization energy across a period?

Accepted Answer

Ionization energy increases due to increased effective nuclear charge ($$Z_{eff}).$$

Question 16

Which of the following statements about the $$d$$ block of the periodic table is correct?

Accepted Answer

It contains the transition metals.

Question 17

A neutral atom of sulfur has how many valence electrons?

Accepted Answer

$$6$$

Question 18

Which of the following best describes the difference between paramagnetic and diamagnetic species?

Accepted Answer

Paramagnetic species have unpaired electrons; diamagnetic species have all electrons paired.

Question 19

Which of the following ions is larger than its parent atom?

Accepted Answer

$$Cl^-$$

Question 20

Which of the following best explains why the second ionization energy of sodium is much higher than the first?

Accepted Answer

The second electron is removed from a noble gas configuration, which is very stable.

Chem chapter 3 study guide

스터디 가이드 - 연습 문제