Formulae on Periodic Classification Of Elements

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Important Formula #1

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.



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Important Formula #2

A group or family is a vertical column in the periodic table.



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Important Formula #3

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.



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Important Formula #4

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.




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Important Formula #5

A period is a horizontal row in the periodic table.



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Important Formula #6

Van der Waals radius - It is half of the shortest internuclear distance between two adjacent non-bonded atoms.
Covalent bond radius - It is half the internuclear distance between two identical atoms joined by a single covalent bond.



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Important Formula #7

Van der Waals radius - It is half of the shortest internuclear distance between two adjacent non-bonded atoms.
Covalent bond radius - It is half the internuclear distance between two identical atoms joined by a single covalent bond.



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Important Formula #8

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.



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Important Formula #9

A group or family is a vertical column in the periodic table.




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Important Formula #10

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.



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Important Formula #11

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.



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Important Formula #12

A period is a horizontal row in the periodic table.



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Important Formula #13

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.



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Important Formula #14

A group or family is a vertical column in the periodic table.




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Important Formula #15

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.



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Important Formula #16

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.



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Important Formula #17

A period is a horizontal row in the periodic table.








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