Name the elements which have the following electronic configuration: $2, 8, 1$

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Solution

Given:
Electronic configuration $= 2, 8, 1$
Formula used:
Atomic number $=$ Number of electrons in the neutral atom.
Calculate the number of electrons:
As the electronic configuration $= 2, 8, 1$
Total number of electrons $= 11$
Find atomic number:
The number of electrons in an atom is equal to the atomic number of the element
Hence, the Atomic number $= 11$
Identify the element:
The element with the atomic number 11 is sodium. Its chemical symbol is $Na$ .

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Similar questions

Which one of the following is a correct electronic configuration of sodium?

(a) 2, 8

(b) 8, 2, 1

(d) 2, 8, 1

A

B

Name the Elements which have the following electronic configurations :

(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1

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