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प्रश्न
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
उत्तर
4Be, 6C, 8O, 5B, 13Al
Electronic configuration of the following elements is:
4Be = 2,2
6C = 2,4
8O = 2,6
5B = 2,3
13Al = 2,8,3
13Al is the most electropositive element among these because 4Be, 6C, 8O, 5B belong to same period, but 13Al belong to next period. According to the trend, electropositive character of an elements increases as we move from top to bottom in a group of the periodic table. This happens as the tendency of an atom to lose electrons increases due to decrease in nuclear charge and increase in numbers of shell.
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संबंधित प्रश्न
An element has its electron configuration as 2, 8, 2. Now answer the following question.
a. What is the atomic number of this element?
b. What is the group of this element?
c. To which period does this element belong?
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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with an explanation.
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Which of this element belong to the period 3? Write their electronic configuration
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An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the atomic number 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?
_______ is the outermost shell for elements of period 2.
Which pair of atomic numbers represents elements in the same group?
Which among the following elements would lose an electron easily?
Find the odd one out and give its explanation.
Write the name.
The group of elements having electronic configuration 2, 2.
The valency of the elements in group 2 is 1.
The elements lithium and beryllium are in the same period because their valencies are similar.
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 | ______ |
Find the period in which these elements can be placed.
4Be, 17Cl, 2He, 13Al
Observe the periodic table given below and write the answers of the questions.
- Write the name and valencies of the elements in 3rd row.
- Classify the elements in this row as metal, nonmetal and metalloids.
- Which block does nonmetals belong to?
- Write name of any two metalloid elements.
