Q7 of 31 Page 198

State whether the following elements belong to a Group (G), Period (P) or Neither Group nor Period (N).


In Li, C, O:



All of three elements belong to same group, i.e., second group


In Mg, Ca, Ba:



All of three elements belong to same period, i.e., second period


In Br, Cl, F:



All of three elements belong to same period, i.e., 7th period


In C, S, Br:



All of three elements do not belong to same period or group


In Al, Si, Cl:



All of three elements belong to same group, i.e., third group


In Li, Na, K:



All of three elements belong to same period, i.e., first period


In C, N, O:



All of three elements belong to same group, i.e., second group


In K, Ca, Br:



All of three elements belong to same group, i.e., 4th group


More from this chapter

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6

Write down the characteristics of the elements having atomic number 17.

Electronic configuration ………………………….


Period number ………………………….


Group number ………………………….


Element family ………………………….


No. of valence electrons ………………………….


Valency ………………………….


Metal or non-Metal ………………………….

 7

State the number of valence electrons, the group number and the period number of each element given in the following table:

 8

Elements in a group generally possess similar properties, but elements along a period have different properties. How do you explain this statement?

 9

s - block and p - block elements except 18th group elements are sometimes called as `Representative elements' based on their abundant availability in the nature. Is it justified? Why?