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An element B belongs to the second perio...

An element B belongs to the second period and Group 13. Give the formula of the oxide.

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Formula of the oxide is `B_2 O_3`.
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U-LIKE SERIES-PERIODIC CLASSIFICATION OF ELEMENTS-VERY SHORT ANSWER QUESTIONS
  1. Which one has the bigger size ? Na (11) or Cl (17), Cl (17) or F (9)

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  2. What is meant by 'groups' of Periodic Table ?

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  3. An element B belongs to the second period and Group 13. Give the formu...

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  4. A, B and C are elements of Dobereiner's triad. If the atomic mass of A...

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  5. State Mendeleev's law.

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  6. Mendeleev classified the elements on the basis of two factors. What we...

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  7. Classify the following elements into groups of triads : Cl, Ca, Ba, ...

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  8. Elements A, B, C and D have atomic numbers 1, 8, 11 and 19 respectivel...

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  9. Size of sodium atom is bigger than that of hydrogen atom. Why?

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  10. Name the element which has twice as many electrons in its second shell...

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  11. What is meant by classification of elements ?

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  12. Mention the common name given to the following elements : Boron, Sil...

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  13. Write two reasons responsible for late discovery of noble gases.

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  14. Write the valency and usual number of electrons of Group 18 of the Per...

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  15. How many horizontal rows are there in the Modem Periodic Table and wha...

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  16. Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the ...

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  17. If an element X is placed in Group 14, what will be the formula and th...

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  18. State one reason for placing Mg and Ca in the same group of Periodic T...

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  19. Why does silicon have valency 4 ?

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  20. Can the following group of elements be classified as Dobereiner's Tria...

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