हिंदी

Complete the following chart. Shell K L N n 2 3 4 2n2 2 × 12 2 × 32 2 × 42 Electron holding capacity 2 8 18

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प्रश्न

Complete the following chart.

Shell n 2n2 Electron holding
capacity
K   2 × 12 2
L 2   8
  3 2 × 32 18
N 4 2 × 42  
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उत्तर

Shell n 2n2 Electron holding
capacity
K 1 2 × 12 2
L 2 2 × 22 8
M 3 2 × 32 18
N 4 2 × 42 32
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अध्याय 2: Periodic Classication of Element - Solve the following Questions

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संबंधित प्रश्न

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.

 1H, 7N, 20Ca, 16S, 4Be, 18Ar Which of these elements belong to the second group?


Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
 19K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?


Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with an explanation.

13Al, 14Si, 11Na, 12Mg, 16S

Which of the above elements has the highest metallic character?


An element has its electron configuration as 2, 8, 2. Now answer the following question.

What is the group of this element?


An element has its electron configuration as 2, 8, 2. Now answer the following question.

To which period does this element belong?


Which pair of atomic numbers represents elements in the same group?


Find the odd one out and give its explanation.


Find the odd one out and give its explanation.


Answer the following question in one sentence.

What determines the chemical reactivity of elements?


Match the columns.

Column A Column B
1) s -block a) Lanthanides and actinides
2) p -block b) Group 3 to 12
3) d -block c) Group 1, 2
4) f -block d) Group 13 to 18
  e) Zero group

Match the columns.

Column A
Electronic
configuration
Column B
Valency
1) 2, 2 a) 1
2) 2, 8, 1 b) 2
3) 2, 5 c) 3
  d) 5

The number of electrons in the outermost shell of an atom determines the ______.


Right or wrong sentence.

The valency of the elements in group 2 is 1.


Right or wrong sentence.

The number of shells decreases in a group from top to bottom.


Write a scientific reason.

Boron and oxygen elements are placed in the second period in periodic table.


Write a scientific reason.

In group 2, beryllium and calcium elements, calcium is more electropositive element than beryllium.


Write name of elements, symbol, atomic number, electronic configuration of second period in modern periodic table?


Identify periods of elements and blocks of elements from given electronic configuration?

  1. 2, 8, 2
  2. 2, 8, 7
  3. 2, 1

Observe the given chart and answer the questions given below.

Element A B C D
Electronic configuration 2, 1 2, 8 2, 8, 1 2, 8, 8
  1. Which elements are in the same row?
  2. Which elements have the same column?
  3. Which elements are in the 18th column?
  4. Which element is more reactive among A and C?
  5. Which of the following elements A or B will form compounds?

Make a chart which shows the name of the element, valency, atomic number, electronic configuration in the 2nd row of the modern periodic table and arrange these elements in ascending order of atomic mass.


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