The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electronic configuration, and recurring chemical properties, whose structure shows periodic trends.

Periods: The horizontal rows (1-7) indicate the number of electron shells.

Groups: The vertical columns (1-18) group elements with similar properties. Elements in the same group often have the same number of valence electrons.

Element Classification:

Metals: Typically found on the left and center, they are conductive, malleable, and ductile.
Nonmetals: Located on the right, they are more varied in properties and often are insulators.
Metalloids: Found between metals and nonmetals, they exhibit properties of both.
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2 comments

Comments (2)

indu marath

Oct 01

How does the periodic table reflect the electronic structure of atoms?
What trends can be observed across a period in the periodic table?
What trends can be observed down a group in the periodic table?
What are noble gases and what are their properties?
How does the periodic table help predict the chemical behavior of elements?
What is the significance of periods and groups in the periodic table?

ridha issak

Oct 07

Replying to

The periodic table reflects the electronic structure of atoms by organizing elements based on their atomic number and electron configurations, particularly in their outer shells.

As you move across a period in the periodic table, atomic size decreases, ionization energy increases, and electronegativity typically increases.

When moving down a group in the periodic table, atomic size increases, ionization energy decreases, and electronegativity generally decreases.

Noble gases are elements in Group 18 that are characterized by their lack of reactivity, complete valence electron shells, and low boiling points.

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