Identify and name the element out of the following element whose electronic configurations are given below. $2, 8, 7$

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Solution

Electronic Configuration: The electronic configuration of an element is a symbolic notation of the manner in which the electrons of its atoms are distributed over different atomic orbitals.
The electronic configuration: $2, 8, 7$
So, the atomic number of element = 2 + 8 + 7 =17
Hence, the element is Chlorine.
The electronic configuration is represented by: Chlorine (Z= $17$ )= $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$
Therefore, The element is Chlorine ( $Cl$ ).

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Solve the following crossword puzzle by identifying the elements from the electronic configuration given for them.

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2.The element with electronic configuration 2,8,4.

4.The element whose uni negative anion has electronic configuration 2,8.

5.The element whose di negative anion has electronic configuration 2,8,8.

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1.The element with electronic configuration 2,8,8.

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3.The element whose di positive cation has electronic configuration 2,8,8.

Identify and name the metals out of the following element whose electronic configurations are given below: $2, 8, 2$

(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
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Identify and name of the metal whose electronic configuration is given below.

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Given below are the electronic configurations of some elements:

(a) 2,8,3

(b) 2,8,18,5

(d) 2,8,18,8,1

(e) 2,8,2

(f) 2,5

(g) 2,8,18,8

Answer the following:

(f) which elements belong to the same group?

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