Class 9 Exam > Class 9 Notes > Electronic Configuration (Structure of Atom), Chapter Notes, Class 9, Science
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Structure of The Atom
Arrangement of electrons in an atom – Electronic Configuration
The maximum number of electrons can be obtained by 2n2; where ‘n’is the orbit number. Thus after knowing the maximum number of electrons for a particular shell, the arrangement of electrons in an atom can be identified. It is called Bohr Bury Schemes.
Rules to write the electronic configuration of an atom
(a) Maximum number of electrons in an orbit is calculated by 2n2, where ‘n’ is number of orbit and may be equal to 1, 2, 3 , . . . .
(b) Electrons occupy the next orbit only after filling the inner orbit completely.
(c) The maximum number of electrons in outermost orbit will not be more than 8.
Electronic configuration of Hydrogen
Atomic number of hydrogen = 1
Therefore number of electrons = 1
Maximum number of electrons in 1st orbit = 2
Since, hydrogen has only one electron, therefore, it will reside in 1st orbit.
Thus electronic configuration of hydrogen 
Number of orbit present in hydrogen = 1
Electronic configuration of Helium
Atomic number of helium = 2
Therefore number of electrons = 2
Therefore, electronic configuration of helium is 
Number of orbit in helium atom = 1
Electronic configuration of Lithium
Atomic number of Lithium = 3
Therefore number of electrons = 3
Since the maximum number of electrons in 1st orbit is equal to 2, therefore, after accommodating 2 electrons in 1st orbit, the third electron will go in 2nd orbit.
Thus, electronic configuration of lithium is 
Number of orbit in Lithium atom = 3.
Electronic configuration of Beryllium
Atomic number of beryllium = 4.
Therefore number of electrons = 4.
Thus, electronic configuration of Beryllium is 
Number of orbit in beryllium = 2
Electronic configuration of Boron
Atomic number of boron = 5
Therefore number of electrons = 5
Thus, electronic configuration of boron is 
Number of orbit in boron = 2
Electronic configuration of Carbon
Atomic number of carbon = 6
Therefore number of electrons = 6
Thus, electronic configuration of carbon is 
Number of orbit in carbon = 2
FAQs on Electronic Configuration (Structure of Atom), Chapter Notes, Class 9, Science
| 1. What is electronic configuration? |  |
Ans. Electronic configuration refers to the arrangement of electrons in the various energy levels or shells within an atom. It describes the distribution of electrons among the different orbitals and suborbitals.
| 2. How is the electronic configuration of an atom determined? | |
Ans. The electronic configuration of an atom is determined by the number of electrons it has. The electrons are filled in different energy levels and orbitals according to the Aufbau principle, Pauli exclusion principle, and Hund's rule.
| 3. What are orbitals and suborbitals in electronic configuration? | |
Ans. Orbitals are regions in an atom where electrons are most likely to be found. They are further divided into suborbitals, which are specific shapes within the orbitals, such as s, p, d, and f suborbitals.
| 4. How does the electronic configuration of an atom affect its chemical properties? | |
Ans. The electronic configuration of an atom determines its chemical properties. It determines the number and arrangement of valence electrons, which are responsible for the atom's ability to form chemical bonds and participate in chemical reactions.
| 5. How can the electronic configuration of an atom be represented? | |
Ans. The electronic configuration of an atom can be represented using the notation of the periodic table. It includes the symbol of the element followed by numbers and letters that represent the energy levels, orbitals, and suborbitals occupied by the electrons.
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