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Ch.22 - The Main Group Elements
McMurry - Chemistry 8th Edition
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모든 교과서McMurry 8th EditionCh.22 - The Main Group Elements문제 22.3
22장, 문제 22.3

Which of the following elements (X) will form a covalent hydride with the formula XH3 that is a gas at room temperature? (LO 22.4)
(a) Al (b) As (c) Ba (d) Se

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1
Identify the elements that can form covalent bonds with hydrogen to create a hydride.
Consider the periodic table position of each element: Al, As, Ba, and Se.
Recall that covalent hydrides are typically formed by nonmetals or metalloids.
Determine which of the given elements is likely to form a gaseous hydride at room temperature.
Recognize that As (arsenic) is a metalloid that can form a covalent hydride, AsH_3, which is a gas at room temperature.

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주요 개념

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Covalent Bonding

Covalent bonding occurs when two atoms share one or more pairs of electrons, typically between nonmetals. This type of bond results in the formation of molecules, such as hydrides, where the hydrogen atom bonds with another element. Understanding the nature of covalent bonds is essential for predicting the properties of compounds, including their state at room temperature.
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02:03
Chemical Bonds

Hydrides

Hydrides are compounds formed between hydrogen and another element. They can be classified into ionic and covalent hydrides, with covalent hydrides being formed by nonmetals. The physical state of hydrides at room temperature can vary; for instance, covalent hydrides of lighter nonmetals tend to be gases, while those of heavier elements may be liquids or solids.
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가이드 코스
02:00
Ionic Hydrides

Periodic Trends

Periodic trends refer to the predictable patterns in the properties of elements as you move across or down the periodic table. These trends influence factors such as electronegativity, atomic size, and the ability to form covalent bonds. Recognizing these trends helps in determining which elements are likely to form gaseous hydrides, as lighter elements in specific groups tend to form such compounds.
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00:38
Periodic Trends
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