Problem 64 - Chemistry A Molecular Approach

Question

Write the symbol for each element and classify it as a metal, nonmetal, or metalloid. a. gold b. fluorine c. sodium d. tin e. argon

Step-by-Step Solution

Answer

a. Au - Metal, b. F - Nonmetal, c. Na - Metal, d. Sn - Metal, e. Ar - Nonmetal.

Step 1: Identifying Gold

Gold is represented by the symbol 'Au' in the periodic table. Based on its properties and its position on the periodic table, it is classified as a metal.

Step 2: Identifying Fluorine

Fluorine is represented by the symbol 'F'. It is found in Group 17 of the periodic table, which is known as the halogens, and it is classified as a nonmetal.

Step 3: Identifying Sodium

Sodium is denoted by the symbol 'Na'. It is located in Group 1 of the periodic table, which contains the alkali metals, thereby classifying it as a metal.

Step 4: Identifying Tin

Tin is represented by the symbol 'Sn'. It can be found in the carbon group of the periodic table and is classified as a metal.

Step 5: Identifying Argon

Argon is symbolized by 'Ar'. It belongs to Group 18, which contains the noble gases, and is classified as a nonmetal.

Key Concepts

Periodic Table

The periodic table is a systematic arrangement of elements based on atomic number, electron configurations, and recurring chemical properties. Elements are organized into rows called periods and columns called groups or families.

Understanding the layout of the periodic table is essential for classifying elements as metals, nonmetals, or metalloids. Typically, metals are found on the left side and center of the table, nonmetals on the right, and metalloids along the dividing line between metals and nonmetals. This division is key to predicting the behavior and reactions of different elements.

For instance, in the exercise, gold (Au) and sodium (Na) are classified as metals due to their positions in groups that display typical metallic properties such as high conductivity and malleability. Recognizing the group placements and periodic trends helps not just in classification but also in understanding the elements' reactivities and bonding tendencies.

Metals, Nonmetals, and Metalloids

Elements can be broadly categorized into three groups: metals, nonmetals, and metalloids. Knowing the common characteristics of each category aids in the classification process.

• Metals are good conductors of heat and electricity, are malleable, and typically have a shiny appearance. Examples include gold (Au) and sodium (Na).
• Nonmetals often have the opposite characteristics of metals. They are poor conductors and can be gases, liquids, or brittle solids at room temperature. Fluorine (F) and argon (Ar) are classic examples of nonmetals.
• Metalloids exhibit properties in between metals and nonmetals, which makes them semiconductors, often used in electronics. While the exercise doesn't include metalloids, elements like boron (B), silicon (Si), and arsenic (As) fall into this category.

When classifying elements like tin (Sn), which is a metal, understanding their characteristics can clarify why they belong to a particular group. These classifications are pivotal in predicting reactions and uses for the elements in practical applications.

Chemical Symbols

Chemical symbols are shorthand representations of the elements based on either their English name or their Latin name. They consist of one or two letters, where the first letter is always capitalized and, if present, the second letter is lowercase.

The familiarity with chemical symbols is crucial for communication in the field of chemistry. For example, 'Au' stands for gold, which comes from the Latin 'aurum,' while 'F' is the symbol for fluorine, directly deriving from its English name. Elements such as sodium (Na), tin (Sn), and argon (Ar) also follow this rule, with Na coming from 'natrium' and Sn from 'stannum.' Understanding and memorizing these symbols is fundamental for students as it enables quick identification and discussion of elements without confusion.