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प्रश्न
Atomic radius is expressed in the unit ______.
पर्याय
nanometer
picometer
micrometer
millimeter
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उत्तर
Atomic radius is expressed in the unit picometer.
Explanation:
Because atoms are extremely small, their atomic radii are measured using very small units of length. While nanometres (1 nm = 10−9m) are sometimes used, the picometre (1 pm = 10−12m) is the most standard and precise unit for expressing atomic size in chemistry.
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संबंधित प्रश्न
Answer the following in respect of element `31/15 P`
Give its electronic configuration
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 elements of second and third periods in increasing order of their atomic size (excluding noble gases).
Which is greater in size an atom or a cation?
Give reason for the following:
Argon atom is bigger than chlorine atom.
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?
Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.
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?
- State the common feature in their electronic configuration.
Arrange the following as per the instruction given in the bracket
Na, K, Li (Increasing atomic size)
The changes in the properties of elements on moving from left to right across a period of the Periodic Table. For the property, choose the correct answer.
The atomic size:
Write information about the given atomic numbers in the table.
| Atomic Number | Electronic configuration | Group | Period | Element |
| 10 | ||||
| 20 | ||||
| 7 |
Which of the following is the correct order of atomic size?
Which one of the following depict the correct representation of atomic radius(r) of an atom?
|
(i) |
(ii) |
|
(iii) |
(iv) |
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
- Where in the periodic table are elements X and Y placed?
- Classify X and Y as metal (s), non-metal (s) or metalloid (s)
- What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed
- Draw the electron dot structure of the divalent halide
- 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.
An element with the largest atomic radius among the following is ______.
Which one has the largest size?
