f") and the orbital diagram. Key ideas required to write a probable
electron configuration are: (i) electrons tend to occupy the lowest energy
orbitals available; (ii) no two electrons in an atom can have all four
quantum numbers alike; and (iii) where ever possible, electrons occupy
orbitals singly rather than in pairs.
• The Aufbau principle describes a hypothetical process of building up one
atom from the atom of preceding atomic number. With this principle and
the idea cited above, it is possible to predict probable electron
configurations for many of the elements. In the Aufbau process, electrons
are added to the s or p subshell of highest principal quantum number in
the representative or main group elements. In transition elements,
electrons go into the d subshell of the second last shell, and in the inner
transition elements, into the f subshell of the third last shell.
• Elements with similar valence-shell electron configurations fall in the
same group of the periodic table. For A-group elements, the group
number corresponds to the number of electrons in the principal shell of
highest quantum number. The period number is the same as the highest
number of principal shell containing electrons (the outer shell). The
division of the periodic table into s, p, d and f blocks greatly assists in
the assignment of probable electron configurations.
• Certain atomic properties vary periodically, when atoms are considered in
terms of increasing atomic number. The properties and trends considered
in this unit are those of atomic radius, ionic radius, ionization energy and
electron affinity. Values of these atomic properties strongly influence
physical and chemical properties of the elements

" /> f") and the orbital diagram. Key ideas required to write a probable
electron configuration are: (i) electrons tend to occupy the lowest energy
orbitals available; (ii) no two electrons in an atom can have all four
quantum numbers alike; and (iii) where ever possible, electrons occupy
orbitals singly rather than in pairs.
• The Aufbau principle describes a hypothetical process of building up one
atom from the atom of preceding atomic number. With this principle and
the idea cited above, it is possible to predict probable electron
configurations for many of the elements. In the Aufbau process, electrons
are added to the s or p subshell of highest principal quantum number in
the representative or main group elements. In transition elements,
electrons go into the d subshell of the second last shell, and in the inner
transition elements, into the f subshell of the third last shell.
• Elements with similar valence-shell electron configurations fall in the
same group of the periodic table. For A-group elements, the group
number corresponds to the number of electrons in the principal shell of
highest quantum number. The period number is the same as the highest
number of principal shell containing electrons (the outer shell). The
division of the periodic table into s, p, d and f blocks greatly assists in
the assignment of probable electron configurations.
• Certain atomic properties vary periodically, when atoms are considered in
terms of increasing atomic number. The properties and trends considered
in this unit are those of atomic radius, ionic radius, ionization energy and
electron affinity. Values of these atomic properties strongly influence
physical and chemical properties of the elements

" /> f") and the orbital diagram. Key ideas required to write a probable
electron configuration are: (i) electrons tend to occupy the lowest energy
orbitals available; (ii) no two electrons in an atom can have all four
quantum numbers alike; and (iii) where ever possible, electrons occupy
orbitals singly rather than in pairs.
• The Aufbau principle describes a hypothetical process of building up one
atom from the atom of preceding atomic number. With this principle and
the idea cited above, it is possible to predict probable electron
configurations for many of the elements. In the Aufbau process, electrons
are added to the s or p subshell of highest principal quantum number in
the representative or main group elements. In transition elements,
electrons go into the d subshell of the second last shell, and in the inner
transition elements, into the f subshell of the third last shell.
• Elements with similar valence-shell electron configurations fall in the
same group of the periodic table. For A-group elements, the group
number corresponds to the number of electrons in the principal shell of
highest quantum number. The period number is the same as the highest
number of principal shell containing electrons (the outer shell). The
division of the periodic table into s, p, d and f blocks greatly assists in
the assignment of probable electron configurations.
• Certain atomic properties vary periodically, when atoms are considered in
terms of increasing atomic number. The properties and trends considered
in this unit are those of atomic radius, ionic radius, ionization energy and
electron affinity. Values of these atomic properties strongly influence
physical and chemical properties of the elements

" />

Ethiopia: Life Hacks Which Has Been Made Simple And Easy

Electron configuration refers to the distribution of electrons among
orbitals in an atom. Introduced here are the subshell notations (or "s,p,d,
f") and the orbital diagram. Key ideas required to write a probable
electron configuration are: (i) electrons tend to occupy the lowest......

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