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प्रश्न
Write an explanation.
Atomic radius
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उत्तर
Atomic radius is the distance from an atom’s nucleus to its outermost electron shell and is used to represent the size of an atom; it is usually given in picometres. Because electrons form a diffuse cloud, atomic radius is an approximate measure rather than a fixed boundary. Across a period the atomic radius decreases as increasing nuclear charge pulls the same-shell electrons closer, while down a group the radius increases because each successive element has an extra electron shell.
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संबंधित प्रश्न
Answer the following in respect of element `31/15 P `
Is it a reducing agent or oxidizing agent?
What do you understand by atomic size? State its unit?
Give the trends in atomic size on moving down the group.
Why is the size of neon greater than fluorine?
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 atomic mass.
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
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?
Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are
With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Atomic size increases from left to right across a period.
The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. Which one of these elements will form ions most readily and why?
While going from top to bottom in a group the atomic radius ______.
Right or wrong sentence.
The size of an atom depends on the number of valence electrons.
Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If the atomic number of carbon is 6, the atomic number of silicon is ______
Which of the following is the correct order of atomic size?
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
Which among the following elements has the largest atomic radii?
Arrange the following as per the instruction given in the bracket:
Carbon, Fluorine, Beryllium (decreasing order of atomic size).
Arrange the following in order of increasing radii:
Cl−, Cl
Explain your choice.
Give reason for the following:
The size of a Cl− ion is greater than the size of a Cl atom.
