Question

An atom has electronic configuration 2,7

          a)  What is the atomic number of this element ? 

          b) What is the valency of this element? 

           c) Write the Group number and the Period number of this element in the Modern Periodic table.

          d) What type of ion will this atom form, anion or cation?

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Answer 1

Answer:

A)The atomic number of this atom is 9

B)Valancy of this atom is 7

C)Period 2 and group is 17

D)The ion of this atom will anion

Answer 2

(a)The atomic number of element with electronic configuration 2,8,7=17.

(b)It has 7 valence electrons, therefore it would be chemically similar to F(9)=2,7.