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For an element, Z = 9. The valency of th...

For an element, Z = 9. The valency of this element will be :

A

4

B

2

C

1

D

3

Text Solution

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The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. The atomic numbers of four elements A,B,C and D are 12,13,15 and 3 res...

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  2. The number of valence electrons in a sulphide ion, S^(2-) is :

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  3. For an element, Z = 9. The valency of this element will be :

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  4. Four elements W,X,Y and Z contain 8,11,9 and 17 protons per atom respe...

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  5. The four atomic species can be represented as follows. Out of these, t...

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  6. There are four elements P,Q,R and S having atomic numbers of 4,18,10 a...

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  7. The atomic number of an element X is 8 and that of element Y is 4. Bot...

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  8. The isotopes of an element contain :

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

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

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

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

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

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

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

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

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

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

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

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

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