Q10 of 30 Page 196

What is the number of valence electrons in the last element of the 3rd size?

The last element of third size means last element of third period and the last element of third period is Argon (Ar) which has 8 valence electrons.


More from this chapter

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8

An element ‘B’ belongs to the second period and Group 13. Give the formula of its oxide.

 9

Give two examples of elements of Groups 1, 2, 16 and 17.

 11

Which one has the bigger size?

Na (11) or Cl (17); Cl (17) or F (9)

 12

Which one has the smaller size?

K (19) or Na (1); B (5) or C (6)