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Ch.2 - Atoms, Molecules, and Ions
Chapter 2, Problem 41g

For each of the following elements, write its chemical symbol, locate it in the periodic table, give its atomic number, and indicate whether it is a metal, metalloid, or nonmetal: (g) arsenic.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Periodic Table

The periodic table is a systematic arrangement of chemical elements, organized by increasing atomic number. Elements are grouped into rows (periods) and columns (groups) based on similar properties. Understanding the layout of the periodic table is essential for identifying elements, their symbols, and their classifications as metals, metalloids, or nonmetals.
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Atomic Number

The atomic number of an element is the number of protons found in the nucleus of its atoms, which determines the element's identity and its position in the periodic table. It also indicates the number of electrons in a neutral atom, influencing the element's chemical behavior and reactivity. For arsenic, the atomic number is 33.
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Classification of Elements

Elements are classified into three main categories: metals, metalloids, and nonmetals, based on their physical and chemical properties. Metals are typically shiny, conductive, and malleable; nonmetals are usually dull, insulative, and brittle; while metalloids exhibit properties of both. Arsenic, for example, is classified as a metalloid, which means it has characteristics of both metals and nonmetals.
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Related Practice
Textbook Question

Consider the mass spectrometer shown in Figure 2.11. Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (b) The height of each peak in the mass spectrum is inversely proportional to the mass of that isotope.

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Textbook Question

Massspectrometry is more often applied to molecules than to atoms. We will see in Chapter 3 that the molecular weight of a molecule is the sum of the atomic weights of the atoms in the molecule. The mass spectrum of H2 is taken under conditions that prevent decomposition into H atoms. The two naturally occurring isotopes of hydrogen are 1H (atomic mass = 1.00783 amu; abundance 99.9885%) and 2H (atomic mass = 2.01410; abundance 0.0115%). (a) How many peaks will the mass spectrum have?

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Textbook Question

Massspectrometry is more often applied to molecules than to atoms. We will see in Chapter 3 that the molecular weight of a molecule is the sum of the atomic weights of the atoms in the molecule. The mass spectrum of H2 is taken under conditions that prevent decomposition into H atoms. The two naturally occurring isotopes of hydrogen are 1H (atomic mass = 1.00783 amu; abundance 99.9885%) and 2H (atomic mass = 2.01410; abundance 0.0115%). (c) Which peak will be the largest, and which the smallest?

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Textbook Question

For each of the following elements, write its chemical symbol, determine the name of the group to which it belongs (Table 2.3), and indicate whether it is a metal, metalloid, or nonmetal: (e) sulfur.

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Textbook Question

The structural formulas of the compounds n-butane and isobutane are shown below. (b) Determine the empirical formula of each.

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Textbook Question

The structural formulas of the compounds n-butane and isobutane are shown below. (c) Which formulas—empirical, molecular, or structural—allow you determine these are different compounds?

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