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प्रश्न
State the property trends in general of elements on moving from left to right in a period of the periodic table.
उत्तर
Property trends of elements from left to right in a period:
- Number of electron shells remains the same.
- Valence electrons increase by one.
The transition from metallic to non-metallic character increases. - Size of atom decreases.
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संबंधित प्रश्न
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3)–, (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.
The following table shows the electronic configuration of the elements W, X, Y, Z:
| Element | w | x | y | z |
| Electronic configurations |
2, 8, 1 | 2, 8, 7 | 2, 5 | 1 |
Answer the following questions based on the table above:
1) What type of Bond is formed between :
a) W and X
b) Y and Z
2) What is the formula of the compound formed between :
a) X and Z
b) W and X
How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?
Fill in the blank in the following statement:
On going down in a group in the periodic table, the metallic character of elements ...............
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which is more electronegative than chlorine?
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?
Arrange the following as per instruction given in the bracket.
Li, K, Na, H ( decreasing order of their potential ionisation )
