Electronic configuration of an element is 1 s^2, 2 s^1, 2 p^2 . It is (a) ground state configu

step 1 So here the electronic configuration of an element is given us 1S2, 2S1, 2p2. And in the options

Electronic configuration of an element is 1 s^2, 2 s^1, 2...

Electronic configuration of an element is $1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{1}, 2 \mathrm{p}^{2} . \underline{\mathrm{It}}$ is (a) ground state configuration of $\mathrm{B}(Z=5)$ (b) excited state configuration of $\mathrm{B}$ (c) ground state configuration of $\mathrm{C}^{+}$ ion $(Z=6)$ (d) impossible configuration

Electronic configuration of an element is $1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{1}, 2 \mathrm{p}^{2} . \underline{\mathrm{It}}$ is
(a) ground state configuration of $\mathrm{B}(Z=5)$
(b) excited state configuration of $\mathrm{B}$
(c) ground state configuration of $\mathrm{C}^{+}$ ion $(Z=6)$
(d) impossible configuration

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Key Concepts

Electronic Configuration

This concept refers to the arrangement of electrons in an atom's orbitals. It defines how electrons are distributed among the various energy levels (shells) and subshells (such as s, p, d, f) according to quantum mechanics.

Ground State vs Excited State

This idea distinguishes between the lowest-energy (ground state) distribution of electrons in an atom and any configuration where one or more electrons have been promoted to higher energy orbitals (excited state). The ground state follows the Aufbau principle with electrons in the minimum energy arrangement, while excited states represent higher energy configurations due to electron promotion.

Aufbau Principle

The Aufbau principle is a rule that electrons occupy orbitals starting from the lowest available energy levels before filling higher ones. It guides the order in which orbitals are populated in a neutral atom's ground state and helps in understanding deviations that lead to excited states.

Orbital Notation

Orbital notation is a shorthand method for expressing the distribution of electrons among the available orbitals, using symbols like 1s, 2s, 2p, etc. Each notation indicates the principal energy level and the type of sublevel, providing insight into the structure of the atom.

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