
Concept explainers
Interpretation:
The ways in which metals and nonmetals form ions needs to be compared.
Concept introduction:
Metals and Non-metals are two important classes of elements in the periodic table. Metals such as gold, silver are used for jewelry, copper is used for jewelry as well as for electrical equipment such as wiring and motors. Non-metals such as Nitrogen is used for preparation of fertilizers, Hydrogen is used as rocket fuel, Carbon in the form of graphite is used in pencils etc.

Answer to Problem 127A
Metals are lustrous, ductile, malleable and they are good conductors of electricity. At room temperature, metals are solids except that of mercury which is liquid at room temperature. Metals are placed in Group 1 and 2 in the periodic table.
Non-metals has no metallic luster and are not shiny, they are neither malleable nor ductile and are poor conductors of electricity. Non-metals are placed in group 14-18 in the periodic table.
Explanation of Solution
There various differences between metals and non-metals. Metals are lustrous, ductile, malleable and they are good conductors of electricity. Metals are placed in group 1 and 2 of the periodic table which contains the most reactive metals. These metals have 1 valence electron. Whereas, Non-metals has no metallic luster and are not shiny, they are not malleable or ductile and are poor conductors of electricity. Non-metals are placed in Group 14-18 of the periodic table. Group 17 contains the most reactive non-metals. These non-metals have 7 valence electrons.
Metals in order to attain noble gas configuration, give away or lose electrons, while nonmetals in order to attain noble gas configuration gain electrons. This is why metals tends to form positive cations and non-metals tends to form negative anions.
Metals are lustrous, ductile, malleable and they are good conductors whereas, non-metals has no metallic luster and are not shiny, they are not malleable or ductile and are poor conductors of electricity.
Chapter 7 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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