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प्रश्न
Write scientific reason.
In same period, boron and oxygen elements have different atomic size.
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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
Which is greater in size an atom or a cation?
Which is greater in size an atom or an anion?
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 atom having the smallest size.
Write a scientific reason.
Atomic radius goes on increasing down a group.
Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.
Arrange the following in increasing order of property indicated
I, I+, I- (atomic size)
Supply the missing word from those in the brackets:
If an element has seven electrons in its outermost shell then it is likely to have the ______ (largest/ smallest) atomic size among all the elements in the same period.
Fill in the blank by selecting the correct word from the bracket.
If an element has seven electrons in its outermost shell then it is likely to have the _____ atomic size among all the elements in the same period.
_______ is the distance between the nucleus of the atom and its outermost shell.
Right or wrong sentence.
The size of an atom depends on the number of valence electrons.
Write information about the given atomic numbers in the table.
| Atomic Number | Electronic configuration | Group | Period | Element |
| 10 | ||||
| 20 | ||||
| 7 |
The electronic configuration of metal A is 2, 8, 18, 1.
The metal A when exposed to air and moisture forms B a green layered compound. A with con. H2 SO4 forms C and D along with water. D is a gaseous compound. Find A, B, C, and D.
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
- Electropositive nature of the element(s) increases down the group and decreases across the period
- 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.
An element with the largest atomic radius among the following is ______.
Arrange the following in order of increasing radii:
Mg2+, Mg, Mg+
Explain your choice.
