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What are magic numbers ?...

What are magic numbers ?

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The numbers 2, 8, 8, 18, 18, 32 are known as magic numbers. It is because of the fact that the elements which occur after these intervals have similar properties. For example, atomic number of Li is 3. If we add 8 (magic number) to 3, then we will get atomic number 11 which stands for sodium. We will find that Li and Na are in the same group and have similar properties.
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OMEGA PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Multiple Choice Questions (MCQs)
  1. What are magic numbers ?

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  2. Mendeleev's periodic law is based on

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  3. In the modern periodic table elements are arranged in order of

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  4. The modern periodic table known as the long form of periodic table was...

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  5. The long form of periodic table has

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  6. Fill in the blanks: The elements of group 17 are called…........

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  7. Alkaline earth metals belong to

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  8. Which of the following represents the electronic configuration of d-bl...

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  9. Explain why transition elements have high melting and boiling points ?

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  10. Which among the following will have largest size ?

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  11. Which of the following is/are correct?

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  12. The energy required to remove an electron from a gaseous atom from its...

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  13. In a period from Li to F ionisation enthalpy

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  14. Given the correct order of electronegativity of central atom in follow...

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  15. The electronegativities of F and H are 4.0 and 2.1 respectively. The p...

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  16. Which of the following element has maximum electron gain enthapy(neg...

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  17. The main source of energy is ….. .

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  18. The 3rd period of the periodic table contains

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  19. Which of the elements show least values of ionisation energies within ...

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  20. r("van der Waal") is

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  21. Which of the following does not have any unit?

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