Periodic Table Quizzes: Test Your Chemistry Knowledge

Question 1

An element with a valence electron configuration of ns²np³ belongs to which group in the Periodic Table?

Accepted Answer

Group 15 (Nitrogen group)

Answer

Group 1 (Alkali metals)

Answer

Group 13 (Boron group)

Answer

Group 17 (Halogens)

Question 2

Which of the following elements is NOT a noble gas?

Accepted Answer

Fluorine

Answer

Helium

Answer

Neon

Answer

Argon

Question 3

Which element has the highest ionization energy?

Accepted Answer

Argon

Answer

Sodium

Answer

Chlorine

Answer

Potassium

Question 4

Which of the following is classified as a metalloid?

Accepted Answer

Boron

Answer

Sulfur

Answer

Potassium

Answer

Magnesium

Question 5

The number of valence electrons in an element primarily determines which of its properties?

Accepted Answer

Reactivity

Answer

Physical state

Answer

Atomic size

Answer

Ionization energy

Question 6

How did Mendeleev's and Moseley's methods for organizing elements in the Periodic Table differ?

Accepted Answer

Mendeleev used atomic mass, while Moseley used atomic number.

Answer

Mendeleev focused on chemical properties, while Moseley focused on physical properties.

Answer

Mendeleev's work was based on experiments, while Moseley's was based on theory.

Answer

Mendeleev's contributions were more significant than Moseley's.

Question 7

Which of the following is the correct arrangement of elements in order of increasing atomic number:
Na, Mg, Al, Si?

Accepted Answer

Na, Mg, Al, Si

Answer

Si, Al, Mg, Na

Answer

Al, Si, Na, Mg

Answer

Mg, Na, Si, Al

Question 8

What is the general trend in ionization energy as you move from left to right across a period?

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

Varies erratically

Question 9

Which of the following compounds is an ionic compound?:

Accepted Answer

Sodium chloride

Answer

Water

Answer

Carbon dioxide

Answer

Ammonia

Question 10

Which of the following is a transition metal?:

Accepted Answer

Iron

Answer

Aluminum

Answer

Phosphorus

Answer

Oxygen

Question 11

Which of the following is the noble gas with the highest boiling point?

Accepted Answer

Radon

Answer

Helium

Answer

Neon

Answer

Argon

Question 12

Across a period in the Periodic Table, how does the ionization energy of elements generally change?

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Question 13

Element 117 has been discovered. Predict its valence electron configuration and probable chemical properties based on its position in the Periodic Table.

Accepted Answer

Valence electron configuration: $7s^2 7p^5$; Probable chemical properties: Highly reactive, forms ionic compounds

Answer

Valence electron configuration: $6s^2 6p^4$; Probable chemical properties: Stable, forms covalent compounds

Answer

Valence electron configuration: $5s^2 5p^3$; Probable chemical properties: Reactive, forms ionic compounds

Answer

Valence electron configuration: $4s^2 4p^6$; Probable chemical properties: Inert, unreactive

Question 14

Which statement accurately describes the organization of the Periodic Table?

Accepted Answer

The table highlights the relationships between elements and their properties.

Answer

Elements are arranged in order of atomic weight.

Answer

Metals, nonmetals, and metalloids are separated into distinct categories.

Answer

The Periodic Table is only relevant to the field of chemistry.

Question 15

The chemical properties of an element are primarily influenced by:

Accepted Answer

Its electron configuration

Answer

Its atomic number

Answer

Its number of neutrons

Answer

Its mass number

Question 16

Which element has the highest electronegativity?

Accepted Answer

Fluorine

Answer

Chlorine

Answer

Bromine

Answer

Iodine

Question 17

The element with the atomic number 17 is classified as a:

Accepted Answer

Nonmetal

Answer

Metal

Answer

Metalloid

Answer

Noble gas

Question 18

Which element is a noble gas?

Accepted Answer

Argon

Answer

Sodium

Answer

Phosphorus

Answer

Sulfur

Question 19

The periodic law states that the properties of elements are a periodic function of their:

Accepted Answer

Atomic number

Answer

Atomic mass

Answer

Number of neutrons

Answer

Number of electron shells

Question 20

The transition metals are located in which block of the Periodic Table?

Accepted Answer

d-block

Answer

s-block

Answer

p-block

Answer

f-block

Question 21

Which is a characteristic property of metals?

Accepted Answer

High electrical conductivity

Answer

Low melting point

Answer

Brittleness

Answer

Transparency

Question 22

Which of the following correctly arranges the alkali metals in order of increasing reactivity?

Accepted Answer

Li < Na < K < Rb < Cs

Answer

Cs < Rb < K < Na < Li

Answer

K < Rb < Na < Li < Cs

Answer

Na < K < Rb < Cs < Li

Question 23

Among the following elements, which one has the highest electronegativity?

Accepted Answer

Fluorine

Answer

Chlorine

Answer

Bromine

Answer

Iodine

Question 24

Which group of elements is commonly referred to as the noble gases?

Accepted Answer

Group 18

Answer

Group 1

Answer

Group 17

Answer

Group 2

Question 25

Which of the following elements exemplifies an element capable of exhibiting multiple oxidation states?

Accepted Answer

Iron

Answer

Sodium

Answer

Fluorine

Answer

Helium

Question 26

The periodic law states that the chemical and physical properties of elements:

Accepted Answer

Are repeated periodically with increasing atomic number

Answer

Are repeated periodically with increasing atomic mass

Answer

Decrease periodically with increasing atomic number

Answer

Increase periodically with increasing atomic mass

Question 27

Metalloids are elements with properties that are intermediate between:

Accepted Answer

Metals and nonmetals

Answer

Nonmetals and halogens

Answer

Alkali metals and alkaline earth metals

Answer

Transition metals and noble gases

Question 28

Which of the following is a transition metal?

Accepted Answer

Iron

Answer

Sodium

Answer

Chlorine

Answer

Carbon

Question 29

Who is primarily recognized for developing the Periodic Table?

Accepted Answer

Dmitri Mendeleev

Answer

John Dalton

Answer

Antoine Lavoisier

Answer

Albert Einstein

Question 30

The element with the electron configuration 1s²2s²2p⁶3s²3p³ belongs to which block in the Periodic Table?

Accepted Answer

p-block

Answer

s-block

Answer

d-block

Answer

f-block

Question 31

Which of the following is a direct consequence of the Aufbau principle?

Accepted Answer

Electrons fill orbitals in order of increasing energy.

Answer

Orbitals can hold a maximum of two electrons.

Answer

The number of electrons in an atom is equal to its atomic number.

Answer

The outermost electrons determine an element's chemical properties.

Question 32

Which element is isoelectronic with the chloride ion (Cl⁻)?

Accepted Answer

Argon (Ar)

Answer

Potassium (K)

Answer

Sulfur (S)

Answer

Sodium (Na)

Question 33

Ionization energy of an element refers to the energy required to:

Accepted Answer

Remove an electron from a neutral atom

Answer

Add an electron to a neutral atom

Answer

Remove an electron from a cation

Answer

Add an electron to an anion

Question 34

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine (F)

Answer

Chlorine (Cl)

Answer

Bromine (Br)

Answer

Iodine (I)

Question 35

The periodic law states that:

Accepted Answer

Properties of elements vary in a repeating pattern based on their atomic numbers.

Answer

Chemical properties of elements are periodic functions of their atomic masses.

Answer

Elements can be organized into a table with similar elements grouped together.

Answer

Chemical reactions of elements are determined by their atomic weights.

Question 36

Which of the following is NOT a characteristic of transition metals?

Accepted Answer

React spontaneously with water at room temperature

Answer

Variable oxidation states

Answer

Ability to form colored ions

Answer

High electrical conductivity

Question 37

Which periodic trend describes the behavior of metallic character? Provide specific examples of elements that exhibit different degrees of metallic properties.

Accepted Answer

Metallic character decreases down a group and increases across a period. (e.g., sodium is more metallic than chlorine, and potassium is more metallic than sodium)

Answer

Metallic character increases down a group and decreases across a period. (e.g., chlorine is more metallic than sodium, and sodium is more metallic than potassium)

Answer

Metallic character remains constant across a period but varies down a group. (e.g., sodium and chlorine have the same metallic character, but sodium is more metallic than potassium)

Answer

Metallic character is unrelated to the position of an element within the Periodic Table. (e.g., sodium and chlorine have the same metallic character, and potassium has the same metallic character as chlorine)

Question 38

Which element in the Periodic Table possesses the highest electronegativity?

Accepted Answer

Fluorine

Answer

Chlorine

Answer

Iodine

Question 39

In which direction does the atomic radius of elements generally change when moving down a group or column in the Periodic Table?

Accepted Answer

Increases

Answer

Fluctuates erratically

Answer

Decreases

Question 40

Who is credited as the primary developer of the modern Periodic Table?

Accepted Answer

Dmitri Mendeleev

Answer

Antoine Lavoisier

Answer

Robert Boyle

Question 41

Determine the valence electron configuration of elements within Group 16 of the Periodic Table.

Accepted Answer

ns²np⁴

Answer

ns²np³

Answer

ns¹np⁴

Question 42

Among the non-metals in the Periodic Table, which element is generally considered the most chemically reactive?

Accepted Answer

Fluorine

Answer

Chlorine

Answer

Nitrogen

Question 43

Which of the following elements belongs to the group of transition metals?

Accepted Answer

Iron

Answer

Aluminum

Answer

Oxygen

Question 44

Which of the following elements is a noble gas?

Accepted Answer

Neon

Answer

Magnesium

Answer

Potassium

Answer

Bromine

Question 45

Which of the following elements belongs to the noble gas group?

Accepted Answer

Neon

Answer

Magnesium

Answer

Sodium

Answer

Chlorine

Question 46

Identify the **correct** observation regarding the trend of atomic radii based on the Periodic Table.

Accepted Answer

Atomic radii generally decrease across a period and increase down a group.

Answer

Atomic radii remain constant across a period and down a group.

Answer

Atomic radii increase across a period and decrease down a group.

Question 47

Which element exhibits the strongest metallic character?

Accepted Answer

Cesium

Answer

Fluorine

Answer

Carbon

Answer

Oxygen

Question 48

Determine the oxidation state of chromium in the compound Cr2O3.

Accepted Answer

+3

Answer

-3

Answer

-6

Answer

+2

Question 49

Which of the following elements is classified as an alkali metal?

Accepted Answer

Sodium

Answer

Sulfur

Answer

Magnesium

Answer

Chlorine

Question 50

Describe the trend in electronegativity observed when moving from left to right across a period in the Periodic Table.

Accepted Answer

Electronegativity generally increases from left to right.

Answer

Electronegativity generally decreases from left to right.

Answer

Electronegativity remains constant across a period.

Answer

Electronegativity varies irregularly across a period.

Question 51

Which element among the following has the **lowest** ionization energy?

Accepted Answer

Potassium

Answer

Calcium

Answer

Titanium

Answer

Zinc