Chemistry Class 11: Periodic Table & Element Classification

Questions and Answers

Which of the following correctly describes a significant feature of the periodic table?

Elements are grouped based on similar chemical properties. (correct)

Elements are classified only by their metallic or non-metallic nature.

There are no specific trends in element reactivity across periods.

Elements are arranged randomly based on their atomic mass.

What is the periodicity of elements primarily based on?

The total mass of the element.

The arrangement of isotopes.

The number of electrons in the outer shell. (correct)

The number of protons in the nucleus.

Which of the following groups contains only metals?

Alkali metals (correct)

Noble gases

Halogens

Chalcogens

What trend occurs as you move from left to right across a period in the periodic table?

<p>Electronegativity generally increases.</p> Signup and view all the answers

Which of the following is not a characteristic of metalloids?

<p>They typically form anions.</p> Signup and view all the answers

Study Notes

Significant Features of the Periodic Table

Displays elements in order of increasing atomic number, which defines their position.
Organizes elements into rows (periods) and columns (groups) based on similar chemical properties.
Groups contain elements with similar valence electron configurations, leading to predictable trends.

Periodicity of Elements

Primarily based on the electron configuration of atoms, determining chemical and physical properties.
The repetition of similar properties occurs at regular intervals as atomic numbers increase.

Groups Containing Only Metals

Group 1 (alkali metals) and Group 2 (alkaline earth metals) exclusively contain metals.
Transition metals, along with lanthanides and actinides, also comprise entirely metallic elements.

Trends Across Periods

As you move from left to right across a period, the atomic radius decreases due to increased nuclear charge, pulling electrons closer.
Ionization energy generally increases across a period, making it harder to remove an electron.

Characteristics of Metalloids

Metalloids, such as silicon and germanium, possess a mix of metallic and non-metallic properties.
A common characteristic disallowed for metalloids is being highly malleable like metals; they are typically brittle.

Description

Test your understanding of the periodic table and the classification of elements in Chemistry Class 11. This quiz covers significant features of the periodic table, periodicity based on atomic structure, and trends across periods and groups. Challenge your knowledge on metals, metalloids, and elemental characteristics!