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Using the periodic table, predict the f...

Using the periodic table, predict the formulas of compounds which might be formed by the following pairs of elements : (a) silicon and bromine (b) aluminium and sulphur.

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(a) Silicon is group 14 element with a valence of 4, bromine belongs to the halogen family with a valence of 1. Hence the formula of the compound formed would be `SiBr_(4)`.
(b) Aluminium belongs to group 13 with a valence of 3, sulphur belongs to group 16 elements with a valence of 2. Hence, the formula of the compound formed would be `Al_(2)S_(3)`.
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NCERT-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-EXERCISE
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  2. What is the basic theme of organisation in the periodic table?

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  3. Which important property did Mendeleev use to classify the elements in...

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  4. What is the basic difference in approach between the Mendellev's perid...

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  5. On the basis of quantum number, which period of the periodic table sho...

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  6. In terms of block, period and group, where would you locate the elemen...

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  7. Write the atomic number of the element present in the third period and...

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  8. Which element do you think would have been named by (a) Lawrence Berke...

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  9. Why do elements with similar properties occur in the same group?

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  10. What do atomic radius and ionic radius really mean to you?

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  11. How do atomic radii vary (a) down the group and (b) along the period f...

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  12. What do you understand by isoelectronic species? Name a species that w...

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  13. Consider the following species: N^(3-),O^(2-),F^(ө),Na^(o+),Mg^(2+) ...

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  14. Explain why cations are smaller and anions larger in radii than their ...

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  15. What is the significance of the terms-'isolated gaseous atom' and 'gro...

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  16. Energy of an electron in the ground state of the hydrogen atom is -2.1...

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  17. Among the second period elements the actual ionisation enthalpies are ...

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  18. How would you explain the fact that the first ionisation enthalpy of s...

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  19. What are the various factors due to which the ionisation enthalpy of t...

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  20. The first ionisation enthalpy of group 13 elements are : Explain ...

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  21. Which of the following pairs of elements would have a more negative el...

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