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प्रश्न
Write a scientific reason.
In group 2, beryllium and calcium elements, calcium is more electropositive element than beryllium.
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उत्तर
- Electronic configuration of beryllium is (2, 2).
The electronic configuration of calcium is (2, 8, 8, 2). - Among beryllium and calcium elements, calcium has the least effective nuclear charge exerting an attractive force on valence electrons.
- This is because of the electrons in the inner shells, which lie in between the valence shell and the nucleus.
- These electrons act as a shield, reducing the attractive force of the nucleus on the valence electrons. Therefore, calcium can lose its valence electrons more readily than beryllium.
Hence, in group 2, calcium is a more electropositive element than beryllium.
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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?
d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
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Write the scientific reason.
The third period contains only eight elements even though the electron capacity of the third shell is 18
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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.
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?
An element has its electron configuration as 2, 8, 2. Now answer the following question.
With which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
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 | Column B |
| 1) Alkaline earth metals | a) Group 18 |
| 2) Alkali metals | b) Group 17 |
| 3) Halogen | c) Group 2 |
| 4) Noble gas | d) Group 1 |
| e) Group 14 |
The number of electrons in the outermost shell of an atom determines the ______.
Write the name.
The group of elements having electronic configuration 2, 2.
Right or wrong sentence.
The valency of the elements in group 2 is 1.
Beryllium and calcium are alkaline earth metals.
Electronic configuration of element A is 2,8,1. Answer the following questions based on this information.
- What is the atomic number of element A?
- Find the group to which this element belongs.
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