7.121 (a) The formula of the simplest hydrocarbon is CH4(methane). Predict the formulas of the simplestcompounds formed between hydrogen and the followingelements: silicon, germanium, tin, and lead. (b) Sodiumhydride (NaH) is an ionic compound. Would you expectrubidium hydride (RbH) to be more or less ionic thanNaH? (c) Predict the reaction between radium (Ra)and water. (d) When exposed to air, aluminum forms atenacious oxide (Al2O3) coating that protects the metalfrom corrosion. Which metal in Group 2A would youexpect to exhibit similar properties? (See page 305.)
Electron Affinity
When an element undergoes a chemical reaction, it either gains energy or loses energy. This gain or loss of energy is due to the phenomena that occur at atomic level. During reaction, atoms either gain electrons from other atoms or lose electrons to other atoms, and in that process, energy is produced.
P-Block Elements
Elements which are present on the right side of the periodic table are called p-block elements. In addition to the noble gases, they include the families of boron, mercury, nitrogen, oxygen and fluorine. These elements have diverse real-life implementations that we regularly experience around us.
Metals and Non-metals
The periodic table is composed of metals, semi-metals and nonmetal elements. The physical and chemical properties of metals and nonmetals differ from each other. The study of metals and nonmetals will help one to understand the appropriate application of the particular element.
7.121 (a) The formula of the simplest hydrocarbon is CH4
(methane). Predict the formulas of the simplest
compounds formed between hydrogen and the following
elements: silicon, germanium, tin, and lead. (b) Sodium
hydride (NaH) is an ionic compound. Would you expect
rubidium hydride (RbH) to be more or less ionic than
NaH? (c) Predict the reaction between radium (Ra)
and water. (d) When exposed to air, aluminum forms a
tenacious oxide (Al2O3) coating that protects the metal
from corrosion. Which metal in Group 2A would you
expect to exhibit similar properties? (See page 305.)
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