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How many periods and groups were present...

How many periods and groups were present in Mendeleev's original periodic table?

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7 periods, 8 groups
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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-VERY SHORT ANSWER TYPE QUESTIONS
  1. On what basis did Mendeleev classify the elements ?

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  2. How many periods and groups were present in Mendeleev's original perio...

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  3. What are the modern names given to ekasilicon and ekaaluminium predict...

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  4. Name two anomalous pairs of elements present in Mendeleev's periodic t...

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  5. Which is the most fundamental property of an atom

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  6. How many groups are present in the long form of the periodic table?

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  7. Which periods are short and which are long in the periodic table and h...

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  8. Name the orbitals which get filled in moving from left to right in fou...

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  9. what is the general electronic configuration of the elements off-block...

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  10. Which groups constitute the d- block in the periodic table ?

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  11. Define atomic radius of an atom.

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  12. Why is van der Waals' radius of an atom greater than its covalent radi...

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  13. State the following: How do the atomic radii change in a period with...

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  14. Give reasons why? The size of cation is smaller than the size of par...

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  15. Give the formula of one species positively charged and one negatively ...

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  16. Among IE(1), IE(2), IE(3) of an element, which is the largest ? Arrang...

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  17. Among s, p, d and f subshells of the same shell, which has the highest...

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  18. How does ionisation energy vary in a group in the periodic table?

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  19. Give one word or a phrase for the following statement: The energy ...

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  20. Name the elements which possess most negative values of electron gain ...

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