Name: The d-block Elements
Uploaded: 2019-07-19
Duration: 8 min 21 s
Description: The periodic table started with elements arranged in increasing order of Z. Now, it can tell us much more about an element. Watch this video to learn more.

Question

Write the electronic configuration of sodium and argon and complete the given table.

Accepted Answer

The atomic number of sodium is $11$ and the electronic configuration of sodium is $2, 8, 1$ . In writing the electron configuration for sodium the first two electrons will go in the $1 s$ orbital. Since $1 s$ can only hold two electrons the next $2$ electrons for sodium go in the $2 s$ orbital. The next six electrons will go in the $2 p$ orbital. The p orbital can hold up to six electrons. We will put six in the $2 p$ orbital and then put the remaining electron in the $3 s$ . Hence, $K$ shell contains $2$ electrons, $L$ shell contains $8$ electrons and $M$ shell contains $1$ electron.

The atomic number of argon is $18$ and the electronic configuration of sodium is $2, 8, 8$ . In writing the electron configuration for Argon the first two electrons will go in the $1 s$ orbital. Since 1s can only hold two electrons the next $2$ electrons for Argon go in the $2 s$ orbital. The next six electrons will go in the $2 p$ orbital. The p orbital can hold up to six electrons. We will put six in the $2 p$ orbital and then put the next two electrons in the $3 s$ . Since the $3 s$ if now full we will move to the $3 p$ where we will place the remaining six electrons. Hence, $K$ shell contains $2$ electrons, $L$ shell contains $8$ electrons and $M$ shell contains $8$ electrons. It is a noble gas.

Shell number	1	2	3	4
Subshells	$s$	$s, p$	$s, p, d$	$s, p, d, f$

Shell number	1			2			3			4
Subshell	s	s	p	s	p	d	s	p	d	f
Representation of subshells	1s	-	-	-	3p	-	-	-	4d	-

Write the electronic configuration of sodium and argon and complete the given table.

Important Questions on Periodic Table and Electronic Configuration

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