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प्रश्न
Write scientific reason.
In same period, boron and oxygen elements have different atomic size.
उत्तर
- Boron and oxygen are placed in the same period. However, their atomic numbers are different.
- Atomic number of boron is 5 and that of oxygen is 8.
- In a period, as the atomic number increases from boron to oxygen, the positive charge on the nucleus increases. At the same time, electrons get added in the same outermost shell. This increases effective nuclear charge.
- As a result, electrons are attracted closer to the nucleus decreasing the size of the oxygen atom.
Hence, in same period, boron and oxygen elements have different atomic size.
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संबंधित प्रश्न
Arrange the following as per the instruction given in the brackets:
Na, K, Li (Increasing atomic size)
Arrange the following as per the instruction given in the bracket:
Mg, Cl, Na, S, Si (decreasing order of atomic size).
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Give the trends in atomic size on moving across the period left to right.
Fill in the blank:
On moving across a period from right to left in the periodic table, the atomic size of the atom ___________.
Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size
Arrange the following in increasing order of property indicated
I, I+, I- (atomic size)
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What happens to the atomic size of elements moving from top to bottom of a group?
On moving from left to right in a periodic table, the size of the atom _______.
Atomic radius is expressed in the unit _______.
While going from top to bottom in a group the atomic radius _______.
Nanometer unit is used to measure atomic radius.
Which of the following is the correct order of atomic size?
Which of the following is the correct order of size?
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Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?
- In below ladder symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.
- Arrange them in the order of their group also.
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- Electronegativity of the element decreases down the group and increases across the period
- Atomic size increases down the group and decreases across a period (left to right)
- Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.
- Name the most electropositive element among them
- Name the most electronegative element
- Name the element with smallest atomic size
- Name the element which is a metalloid
- Name the element which shows maximum valency.
Which one of the following has the largest atomic radius?
