Name the elements which have the following electronic configuration .
(i) 2, 6 (ii) 2, 7 (iii) 2, 8, 1 (iv) 2, 8, 7 (v) 2, 8

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Solution

The electronic configuration: The distribution of electrons in different energy shells of the atom is known as the electronic configuration.
(i) 2, 6 electronic configuration implies that the atomic number is 8 and hence the element is Oxygen(O).
Oxygen has 2 electrons in 1st energy level and 6 electrons in 2nd energy level and required 2 electrons to obey an octet rule.
(ii) 2, 7 electronic configuration implies that the atomic number is 9 and hence the element is Fluorine(F).
Fluorine has 2 electrons in the 1st energy level and 7 electrons in the 2nd energy level and required 1 electron to obey an octet rule.
(iii) 2, 8,1 electronic configuration implies that the atomic number is 11 and hence the element is Sodium(Na).
Sodium has 2 electrons in the 1st energy level,8 electrons in the 2nd energy level, and one electron in the 3rd energy level, and by losing 1 electron to obey an octet rule.
(iv) 2, 8,7 electronic configuration implies that the atomic number is 17 and hence the element is Chlorine(Cl).
Chlorine has 2 electrons in the 1st energy level and 8 electrons in the 2nd energy level and 7 electrons in the 3rd energy level and required 1 electron to obey an octet rule.
(v) 2, 8 electronic configuration implies that the atomic number is 10 and hence the element is Neon(Ne).
Neon has 2 electrons in the 1st energy level and 8 electrons in the 2nd energy level and No electrons are required to obey an octet rule.

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Q. Identity the electronic configuration of the Inert gas elements, third-row elements, seventeen group elements, and second group elements:
(i) (2, 8, 2),
(ii) (2, 8, 8),
(iii) (2, 8, 1),
(iv) (2, 7),
(v) (2, 2),
(vi) (2, 8)

Q. Element 'A' has electronic configuration

2, 7,

'B' has configuration

2, 8, 6,

'C' has configuration

2, 8, 8

while 'D' has

2, 8, 7.

Which element will show similar chemical properties?

Four elements A, B, C, and D have the following electronic configuration:
A: 2, 6
B: 2, 8, 8
C: 2, 8, 8, 2
D: 2, 7

i. Which element is an inert gas?
ii. How many electrons should 'D' gain to achieve an octet electronic configuration?
iii. What type of bond is formed when element C combines with element A?
iv. What will be the formula of the compound formed between A and C?

An element A atomic number 7 mass number 14
B electronic configuration 2, 8, 8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E electronic configuration 2, 8, 8, 1
State (i) valency of each element (ii) which one is metal (iii) which is non-metal (iv) which is inert gas.

The electronic configuration of elements A, B, C, D and E are :
A (2, 8, 7) B (2, 8, 1) C (2) D (2, 6) E(2, 8)

Which of the above element/s are inert?

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Name the elements which have the following electronic configuration .(i) 2, 6 (ii) 2, 7 (iii) 2, 8, 1 (iv) 2, 8, 7 (v) 2, 8

Name the elements which have the following electronic configuration .
(i) 2, 6 (ii) 2, 7 (iii) 2, 8, 1 (iv) 2, 8, 7 (v) 2, 8