Advertisements
Advertisements
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?
Advertisements
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
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?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
What is a period in a periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Name two elements in each case:
Transition element
What is meant in the periodic table by a period?
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
On moving from left to right in a period in the periodic table, the size of the atom ______
Which of the following is the outermost shell for elements of period 2?
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
