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What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3? - Chemistry

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प्रश्न

What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?

संक्षेप में उत्तर
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उत्तर

The elements at the end of the period have 8 electrons in the valence shell.

Ne = 2, 8

Ar = 2, 8, 8

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अध्याय 5: The Periodic Table - Exercise

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विराफ जे दलाल Simplified ICSE Chemistry [English] Class 9
अध्याय 5 The Periodic Table
Exercise | Q 3

संबंधित प्रश्न

An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3), (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.


How does the valency of elements change of moving from left to right in the third period of the periodic table?


An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:

(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.


State the valency of the elements of periods 3 and write the formula of their oxides.


How many groups and periods are there in the modern periodic table?


Choose the word or phrase from the bracket which correctly complete each of the following statement: 

Metals are good ................. (oxidising agents/reducing agents) because they are electron ............. (acceptors/donors). 


The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18

 

 

 

D

 

B

C

 

A

 

 

E

Which type of ion will be formed by elements A, B, and C.

 


Give Scientific Reason:
Atomic size increase down the group.

Name or state following with reference to the element of the first three periods of the periodic table.

A metal in period 3 having valency 3.


Fill in the blanks from the words A to F given below’.

A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative

Across a period from left to right in the Modern Periodic Table.
No. of electron shells _________; No. of valence electrons __________: Electronegativity increases Character of elements changes from electropositive to ________.


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