Question

Table-A
Atomic number
Element
Electronic Configuration
He
2
2,1
2,2
Be
5
2,3
Student Element
Student
A
N
Table - B
Electronic configuration
2,4
2,5
2,6
2,7
2,7
2,8, 1
Student B
Ne
Na
4.1 In the table B which student write the incorrect electronic configuration and write the its
name?
4.2 How many cells are used to write the electronic configuration of element?
4.3 The atomic number of sodium is
(a) 11
(b) 13
(c) 14
(d) 9
4.4 If the atomic number of element is 12 than write down it's electronic configuration.
(a) 2, 2,8
(b) 2,4,6
(c) 2,8,2
(c)2,8,2​

Answer 1

Answer:

4.1: NE is incorrect electronic configuration of the student. Because the the electronic configuration of Ne is 2,8.

4.2: There is no particular number of shells which is universal of electronic configuration for every elements :

1) The no. of shells increases with the total no. of electron present in a particular element.

2) Also, a same elements can get different no. of shells due to negative and positive ions for that elements which changes the total no. of electrons.

3) That's why there is no particular number of shells for donating the electronic configuration of elements.

4.3: Atomic no. of sodium is 11

4.4: 2,8,2 is the electronic configuration of 12