Answer :
Final answer:
Metals are shiny, conductive, and malleable, while nonmetals are dull, brittle, and poor conductors. Metalloids have properties in between. The periodic table organizes elements by their atomic numbers, with periods and groups representing electron shells and similar properties. Properties change across a period due to increasing protons and effective nuclear charge.
Explanation:
Properties of metals:
Metals are typically shiny, conductive, and malleable. They tend to have high melting and boiling points and are good conductors of heat and electricity.
Properties of nonmetals:
Nonmetals are generally dull, brittle, and poor conductors of heat and electricity. They have low melting and boiling points and are often gases or soft solids at room temperature.
Properties of metalloids:
Metalloids have properties that are intermediate between metals and nonmetals. They can exhibit characteristics of both groups, such as being semi-conductive and having varying degrees of luster.
Arrangement of elements in the modern periodic table:
The elements in the periodic table are organized based on their atomic numbers, which represent the number of protons in an atom's nucleus. The periodic table is divided into periods (horizontal rows) and groups (vertical columns). Elements within the same period have a similar number of electron shells, while elements within the same group have similar properties due to their similar electron configurations. As you move across a period from left to right, the properties of elements change. This is because the number of protons and the effective nuclear charge increase, resulting in changes in atomic size, ionization energy, and electronegativity.
Learn more about Properties of metals, nonmetals, and metalloids, and the arrangement of elements in the periodic table here:
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