Ch.2 - Atoms, Molecules, and Ions

Brown - Chemistry: The Central Science 14th Edition

Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo

Brown 14th Edition

Ch.2 - Atoms, Molecules, and Ions

Problema 3a

Capitolo 2, Problema 3a

Four of the boxes in the following periodic table are colored. Which of these are metals and which are nonmetals?

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insert step 1: Identify the location of the colored boxes on the periodic table.

insert step 2: Recall that metals are typically located on the left side and in the center of the periodic table, while nonmetals are found on the right side.

insert step 3: Check if the elements in the colored boxes are in groups known for metals, such as alkali metals, alkaline earth metals, transition metals, or post-transition metals.

insert step 4: Determine if any of the colored boxes are in groups known for nonmetals, such as the halogens or noble gases.

insert step 5: Classify each element in the colored boxes as either a metal or a nonmetal based on their position and group characteristics on the periodic table.

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Metals

Metals are elements that typically exhibit high electrical and thermal conductivity, malleability, ductility, and a shiny appearance. They are usually found on the left side and in the center of the periodic table. Common examples include iron, copper, and gold. Metals tend to lose electrons during chemical reactions, forming positive ions.

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03:12

Transition Metals

Nonmetals

Nonmetals are elements that generally lack the properties of metals and are found on the right side of the periodic table. They are poor conductors of heat and electricity, and they can be gases, liquids, or solids at room temperature. Nonmetals tend to gain or share electrons in chemical reactions, forming negative ions or covalent bonds. Examples include oxygen, nitrogen, and sulfur.

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01:12

Nonmetal Properties

Periodic Table Classification

The periodic table classifies elements based on their atomic number, electron configuration, and recurring chemical properties. Elements are organized into groups (columns) and periods (rows), with metals on the left, nonmetals on the right, and metalloids in between. This classification helps predict the behavior of elements in chemical reactions and their physical properties.

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02:40

Periodic Table Classifications

Pratica correlata

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A charged particle moves between two electrically charged plates, as shown here.

(a) What is the sign of the electrical charge on the particle?

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The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are ²⁹³Nv, and the blue spheres are ²⁹⁵Nv. (a) Assuming that this sample is a statistically representative sample of the element, calculate the percent abundance of each element.

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The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are ²⁹³Nv, and the blue spheres are ²⁹⁵Nv. (b) If the mass of ²⁹³Nv is 293.15 u and that of ²⁹⁵Nv is 295.15 u, what is the atomic weight of Nv?

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Does the following drawing represent a neutral atom or an ion?

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Which of the following diagrams most likely represents an ionic compound, and which represents a molecular one? Explain your choice.

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