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(a) What are valence electrons ? Where a...

(a) What are valence electrons ? Where are valence electrons situated in an atom ?
(b) What is the number of valence electrons in the atoms of an element having atomicm number 13 ? Name the valence shell of this atom.

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The correct Answer is:
(b) 3 ; M shell
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
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  3. (a) What are valence electrons ? Where are valence electrons situated ...

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  5. (a) What are radioactive isotopes ? Give two examples of radioactive i...

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  6. (a) Define valency of an element. What valency will be shown by an ele...

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  7. The mass number of two atoms X and Y is the same (40 each) but their a...

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  8. Which of the following statement is correct about the atom of an eleme...

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  9. There are two species represented as ""^(35)Cl and ""^(37)Cl. Which of...

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  10. The radioactive isotope used in the treatment of cancer is :

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  11. Elements with valency 1 are

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  12. In a sample of ethyl ethanote (CH(3)COOC(2)H(5)) the two oxygen atoms ...

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  13. Which of the following elements does not exhibit electrovalency ?

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  14. The number of valence electrons in a graphite atom is :

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  15. The atomic numbers of four elements A,B,C and D are 12,13,15 and 3 res...

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

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

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

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

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

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