Question

5 summarize what are the three main classes of elements? provide two physical properties for each class of elements.

Explanation:

Elements are grouped into three core classes based on shared physical and chemical traits. Each class has distinct observable physical properties:

1. Metals: Typically have high electrical conductivity (they readily carry electric current) and are malleable (can be hammered into thin sheets without breaking).
2. Nonmetals: Generally are poor electrical insulators (do not conduct electricity well) and are brittle (break or shatter when force is applied).
3. Metalloids: Have intermediate electrical conductivity (they can conduct electricity under certain conditions, making them semiconductors) and often have a metallic luster (shiny appearance) like metals but are brittle like nonmetals.

Answer:

The three main classes of elements, with two physical properties each, are:

1. Metals: High electrical conductivity; malleable (can be shaped without breaking)
2. Nonmetals: Poor electrical conductivity; brittle (shatters under force)
3. Metalloids: Intermediate electrical conductivity (semiconducting); has a metallic luster but is brittle