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प्रश्न
Right or wrong sentence.
The size of an atom depends on the number of valence electrons.
पर्याय
Right
Wrong
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उत्तर
The given sentence is wrong.
Explanation:
Atomic size is determined mainly by the principal quantum number (which shell the valence electrons occupy) and by effective nuclear charge and shielding, not simply the count of valence electrons. Atoms down a group get a new shell, so size increases, while across a period, added electrons stay in the same shell, but higher nuclear charge pulls them closer, so size decreases.
संबंधित प्रश्न
Answer the following in respect of element `31/15 P `
Give its formula with chlorine?
Give the trends in atomic size on moving down the group.
Arrange the following in order of increasing radii:
CI- , CI
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Arrange the following in increasing order of property indicated
I, I+, I- (atomic size)
Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are
Arrange the following as per the instruction given in the bracket.
Mg, Cl, Na, S, Si (increasing order of atomic size)
_______ is the distance between the nucleus of the atom and its outermost shell.
Atomic radius is expressed in the unit ______.
While going from top to bottom in a group the atomic radius ______.
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
Which of the following is the correct order of atomic size?
Which of the following is the correct order of size?
Which of the following is the correct order of atomic size?
When an atom of iodine becomes an iodine ion (I–) the radius will ______
Which one of the following depict the correct representation of atomic radius(r) of an atom?
|
(i) |
(ii) |
|
(iii) |
(iv) |
Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
| F, | Na, | Mg, | Al, | Si, | P, | S, | Cl, | Ar, | K |
- Pick two sets of elements which have similar properties.
- The given sequence represents which law of classification of elements?
- 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.
In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:
The element A would have ______ atomic size than B.
