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प्रश्न
What is periodicity in properties of elements with reference to the Modern Periodic Table?
उत्तर
The occurrence (or arrangement) of the elements with similar properties after certain regular interval when they are arranged in increasing order of atomic number is called periodicity. The periodic repetition of the properties is due to the recurrence of similar valence shell configuration after regular interval.
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Give two example of group 1 elements.
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
How many groups and periods does the modern periodic table have?
What do you understand by typical elements?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
What is meant in the periodic table by a period?
The groups 1 and 2 constitute the _______ block.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
