Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Consider the following elements (atomic numbers are given in parenthesis)  Ca(20) ;    K(19) ;     F(9) ;     Be(4)  (a) Select :       (i) the element having one elec

Consider the following elements (atomic numbers are given in parenthesis)  Ca(20) ;    K(19) ;     F(9) ;     Be(4)

 (a) Select :  

    (i) the element having one electron in the outermost shell

    (ii) two elements of the same group. Write the number of this group.

 (b) Write the formula of the compound formed by the union of Ca(20) and the element X(2, 8, 7). 
 

 

 

 

 
 
 
 
 

Answers (1)

Electronic configuration - 

(i) Ca_{20} = 2,8,8,2

(ii) K_{19} = 2,8,8,1

(iii) F_{9} = 2,7

(iv) Be_{4} = 2,2

K19 has one electron in the outermost shell.

(ii) Be_{4} and Ca_{20} belongs to the same group i.e., group 2. They both have two electrons each in their outermost shell.

Posted by

Priyanka Kumari

View full answer

Similar Questions

Latest Question