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प्रश्न
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
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उत्तर
Modern Periodic Law:
The physical and chemical properties of elements are a periodic function of their atomic numbers.
- There are 18 vertical columns called groups (numbered from 1 to 18).
- There are 7 horizontal rows called periods (numbered from 1 to 7).
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Why do all the elements of the same group have similar properties?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
What is the number of valence electrons in the atoms of first elements in a period?
What is a period in a periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
______ and ______ are called inner transition elements.
Which of the following statements about the Modern Periodic Table is correct:
