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$\textbf{Explain Electronic Configuration}$

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Answer 1

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$\sf{\underline{What\:is\:an\:Electronic\:configuration\:?}}$

It tells about the arrange of electron around the nucleus in an atom. 


$\sf{\underline{How\:electrons\:are\:filled\:?}}$

⚫Electrons are filled according to increasing order of energy level.

⚫The energy level are denoted as K, L, M.etc.


$\sf{\underline{How\:to\:write\:an\:electronic\:configuration\:?}}$


⚫To write the electronic configuration of element with atomic no. 1 to 18,

⚫At first put the 2 electrons to first energy level and then write for next level.


$\sf{\underline{Let\:us\:take\:an\:example:}}$


Atomic no. 15


$\sf{\underline{1st\:level\:will\:have\:2\:electrons}}$

(electrons remains 15-2 =13)


$\sf{\underline{2nd\:level\:will\:have\:8\:electrons\:out\:of\:13}}$

(electron remains 13-8=5)


3rd level will accommodate remaining 5 electron.

$\sf{\underline{And\: configuration\:will\:be\:2, 8, 5.}}$

Answer 2

$\huge\bf\blue{\mid{\overline{\underline{Your\: Answer}}}\mid}$

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♣ What is electronic configuration?

✍️ The electron configuration of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells.

♣ Some More information :-

✍️ Electrons fill orbitals in a way to minimize the energy of the atom.

✍️ Therefore, the electrons in an atom fill the principal energy levels in order of increasing energy (the electrons are getting farther from the nucleus).

✍️ The order of levels filled looks like this:-

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p

(see the attachment also )

♣ How to write electronic configuration?

✍️ Example:-

♦ Hydrogen and Helium

The first three quantum numbers of an electron are n=1, l=0, ml=0.

Only two electrons can correspond to these, which would be either

ms = -1/2

 or

ms = +1/2.

✍️ As we already know from concept of quantum numbers and electron orbitals, we can conclude that these four quantum numbers refer to the 1s subshell.

✍️ If only one of the ms values are given then we would have 1s1 (denoting hydrogen),

if both are given we would have 1s2 (denoting helium).

♠ Note:-

The arrow describes the way to first fill the orbitals and so on ( in the attachment).

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