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प्रश्न
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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उत्तर
As we move from left to right in a period, the size decreases, therefore, it will be smaller than Cesium.
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संबंधित प्रश्न
The modern periodic table was prepared by ______.
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Name two elements in halogens.
Name two elements in each case:
Transition element
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
State what is meant by the term chemical formula.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
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- Atom size of Y element is smaller than atom size of X element? Explain?
How does the property vary in periods and in groups?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
