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प्रश्न
Study the radius of the element given below and answer the following questions.
| elements | K | Na | Rb | Cs | Li |
| Atomic radius (pm) | 231 | 186 | 244 | 262 | 151 |
a) Which of the above elements have the smallest atom?
b) In which group of the modern periodic table the above element are belongs?
c) What is the periodic trend observed in the variation of atomic radii down a group?
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उत्तर
a) Li
b) first group
c) while going down a group atomic radius goes on increasing. As a result, atomic size increases.
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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 elements of second and third periods in increasing order of their atomic size (excluding noble gases).
Why is the size of neon greater than fluorine?
Which is greater in size an atom or an anion?
Write the name and symbol of the element from the description.
The atom having the smallest size.
Write the name and symbol of the element from the description.
The atom having the smallest atomic mass.
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size
On moving from left to right in a periodic table, the size of the atom ______.
The size of an atom is indicated by its ______.
Right or wrong sentence.
Moving from left to right, the size of the atom decreases.
Write scientific reason.
In same period, boron and oxygen elements have different atomic size.
Which of the following is the correct order of size?
Which of the following gives the correct increasing order of the atomic radii of O, F, and N?
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
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.
An element with the largest atomic radius among the following is ______.
Which one of the following has the largest atomic radius?
