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प्रश्न
The number of electrons in the outermost shell of an atom determines the _______.
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उत्तर
The number of electrons in the outermost shell of an atom determines the valency of an element.
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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.
3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3?
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.
11Na, 15P, 17Cl, 14Si, 12Mg Which of these has largest atoms?
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?
An element has its electron configuration as 2,8,2. Now answer the following questions.
i. What is the atomic number of this element?
ii. What is the valency of this element?
iii. What is the group of this element?
iv. To which period does this element belong?
v. With which of the following elements would this element resemble?
`_7N , _4Be , _18Ar , _17CL`
An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the group of this element?
Find the odd one out and give its explanation.
Write the name of noble gas having 2 electrons in its valence shell.
What determines the chemical reactivity of elements?
Match the columns.
| Column A | Column B |
| Electronic configuration |
Valency |
| 1) 2, 2 | a) 1 |
| 2) 2, 8, 1 | b) 2 |
| 3) 2, 5 | c) 3 |
| d) 5 |
Write the name.
The element having stable electron configuration from the third period.
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.
Write an Explanation.
Group
Find the period in which these elements can be placed.
4Be, 17Cl, 2He, 13Al
Distinguish between:
Group - Period
Write name of elements, symbol, atomic number, electronic configuration of second period in modern periodic table?
