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If the number of electrons in an ion Z^...

If the number of electrons in an ion `Z^(3-)` is `10`, the atomic number of element `Z` will be :

A

`7`

B

`5`

C

`10`

D

`8`

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The correct Answer is:
A
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
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  2. Which of the following represents a correct chemical formula ?

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  3. If the number of electrons in an ion Z^(3-) is 10, the atomic number...

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  4. The anion of an element has :

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  5. A particle X has 17 protons, 18 neutrons and 18 electrons. This part...

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  6. An element which can exhibit valencies of 2, 4 and 6 can be :

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  7. The atomic number of an element E is 16. The number of electrons in i...

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  8. The cation of an element has :

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  9. Two elements X and Y have valencies of 5 and 3, and 3 and 2, respecti...

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  10. The number of electrons in an ion Y^(2+) is 10. The atomic number of e...

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  11. A particle P has 18 electrons, 20 neutrons and 19 protons. This parti...

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  12. An ionic compound will be formed by the combination of one of the foll...

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  13. Molecular compounds are usually formed by the combination between :

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  14. The formula of a compound is X(3)Y. The valencies of element X and Y ...

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  15. The formula of the sulphate of an element X is X(2)(SO(4))(3). The for...

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  16. An element A forms an oxide A(2)O(5). (a) What is the valency of ...

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  17. An element X forms the following compounds with hydrogen, ca...

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  18. If the aluminium salt of an anion X is Al(2)X(3), what is the valency...

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  19. The formula of carbonate of a metal M is M(2)CO(3). (a) What will ...

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  20. The atom of an element X contains 17 protons, 17 electrons and 18 neu...

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