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Which is the number of valence electrons...

Which is the number of valence electrons in :
(a) sodium ion, `Na^(+)`
(b) oxide ion, `O^(2-)`

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The correct Answer is:
(a) 8 (b) 8
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. The atomic number of an element X is 8 and that of element Y is 4. Bot...

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  2. The isotopes of an element contain :

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  3. Which is the number of valence electrons in : (a) sodium ion, Na^(+)...

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  4. Atom A has a mass number 209 and atomic number 82 Atomic B has a mas...

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  5. Which of the following pairs are isotopes ? Give reasons for your choi...

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  6. Three different atoms of oxygen are represented as : .(8)^(16)O,.(8)...

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  7. The atomic species A and B have different number of protons but the sa...

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  8. Composition of the nuclei of two atomic species A and B is given as un...

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  9. Which of the following pairs are isobars ? (i) .(26)^(58)A, .(28)^(5...

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  10. The number of protons, neutrons and electrons in particles A to E are ...

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  11. The composition of two atomic particles is given below : {:(,"X","Y"...

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  12. Four students (A),(B),(C) and (D) observed the colour and solubility o...

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  13. The white of an egg, common salt, sugar and fine sand are added to wat...

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  14. The correct procedure of heating iron-sulphur mixture to prepare iron ...

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  15. A student while heating solid lead nitrate taken in a test tube would ...

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  16. The following precautions were listed for the experiment on determinat...

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  17. The correct procedure for preparing a colloidal solution of egg albumi...

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  18. Four students (A), (B), (C) and (D) independently observed the evapora...

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  19. A student takes a mixture of sand and ammonium chloride in a china dis...

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  20. A student takes some water in a beaker and heats it over a flame for d...

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