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Write the atomic number of the element p...

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

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Since it belongs to 3rd period, it will have outermost shell, `n =3.` Its configuration will be `3s ^(2) 3p ^(5).` Therefore, `n =3.` Its configuration will be 17.
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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -NCERT FILE (NCERT TEXTBOOK EXERCISE)
  1. On the basis of quantum numbers, justify that the fourth period of the...

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  2. In terms of period and group where would you locate the element with Z...

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

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  4. Which element do you think would have been named by (a) Lawrence Ber...

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  5. Why do elements in the same period have different physical and chemica...

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

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  7. How do atomic radius generally vary in a period and in a group for s-a...

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

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

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

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

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

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

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

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

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  16. The first ionization enthalpy values (in kJ mol^(-1)) of group 13 elem...

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

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  18. Would you expect the second electron gain enthalpy of O as positive, m...

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  19. What is the basic difference between the terms electron gain enthalpy ...

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  20. How would you react to the statement that the electronegativity of N o...

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