Periodic Classification Of Elements


 

Periodic Classification Of Elements logoSubject: Chemistry    Exam: MUOET Engineering

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Important Concepts in Periodic Classification Of Elements

Find notes, videos, important points and questions to practice on each of these concepts.

  • Modern Periodic Table

  • Aufbau Principle

  • Representative Elements

  • Nomenclature of Elements

  • Periodic Properties - Atomic Radius

  • Periodic Properties - Ionisation Energy

  • Periodic Properties -Electron Affinity

  • Periodic Properties -Electronegativity

  • Periodic Properties -Electropositivity

  • Periodic Properties



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Important Points

Elements in the same period show trends in atomic radius, ionization energy, electron affinity, and electro negativity. Moving left to right across a period, atomic radius usually decreases. This occurs because each successive element has an added proton and electron which causes the electron to be drawn closer to the nucleus.
A group or family is a vertical column in the periodic table.
The total number of electron shells an atom has determines the period to which it belongs. Each shell is divided into different subshells, which as atomic number increases are filled in roughly this order.
Quantum mechanical theories of atomic structure explain group trends by proposing that elements within the same group have the same electron configurations in their valence shell, which is the most important factor in accounting for their similar properties. Elements in the same group also show patterns in their atomic radius, ionization energy, and electro negativity. From top to bottom in a group, the atomic radii of the elements increase.
A period is a horizontal row in the periodic table.
 
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